Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b01cb0c34ae9d0…

MALICIOUS

PDF

119.2 KB Created: 2021-06-27 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 246d66c9a54a201004eff8bc55874f9d SHA-1: d62b2444314cddc3a9d198d88b3b8b16bb7856c7 SHA-256: 92b01cb0c34ae9d0ae82f5dbe55c690feeb72190c1339c32916949a26732193a
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of a visual download button and the ML classifier's high confidence score further support a malicious intent. The ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6ac5b59508ce7f651c738de6157496c5/gegeminaru.pdf In PDF document text
    • http://goteneplast.se/files/images/file/gumeralavanozubalaxo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2853262c---43315630361.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/kejugagodoxiwer.pdfIn PDF document text
    • http://coffee33.ru/archive/file/17910878385.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/memanavinoraz.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/xivitunipow.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/jemor.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d690f0532---1584522404.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/43299372734.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4bfafeaa17e5ad85aeb47bbe81843ad7/xudagaduvor.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bk2vj7ta3vn7a1rba4moe81gv5/83332241259.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/020dd9d9f494f4e2e7512fd1f2c4a301/dimipama.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h65l5ci6nfcv26qbbmuiefvu0b/24016943379.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/tirufurotulowefew.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/987fe2c7b801092aec8887f6c00a7626/20068552184.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/94198395094.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54129192a7---53261100114.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae80bfce3---xezawekawelawedufadomeli.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073447e566eb---92408342242.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b095499a2---35536544150.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/654t1620r2lti8d24t3gjdg5m2/27432179777.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe74cbfc7---pujikuvozaz.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c385ccae89d---99927690402.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/tebakipetilikibumipopazax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+buy+limpets+elite+dangerousPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17361 16304 bytes
SHA-256: 1e33e13ce0ecf2ae7a562302d96d31eea3399b131995a0a0637f50613007dcf6
font_01_sfnt_off00019d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5AC 11168 bytes
SHA-256: c71d95aa0192a7f92f71b1626e6149defc34abc334bcf3c903d7d38e6c50ef07