Malicious PDF — malware analysis report

Static analysis result for SHA-256 1731e5d36e1921a1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 03:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 637ced4c51d2c0d39a51fb47f8bf6901 SHA-1: 4fd7c133ed64a31d54e41b796061ed585fff460f SHA-256: 1731e5d36e1921a1124ec80a67deada83a8507308ed0877bb282d868fbb1aa22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of urgency language further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://youngthisyear.com/ckfinder/userfiles/files/tobezazekabinekelorise.pdf In PDF document text
    • http://isdoor.ru/uploads/files/fimugajunuzikiv.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/18571166280.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/lepinod.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134892e261bd---76799653555.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/waruk.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/4068888160.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161313905a671a---gugewijewit.pdfIn PDF document text
    • http://pnalog.ru/images/file/vadam.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/sojujadetosigigiw.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2ffa9440c33d439f10d02207991e1f8/85513507345.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/vazimedadokekoxuruviwuri.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/72544955000.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/31607333484.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/ziwatinunaligofi.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/pibigafazofiraxigufegired.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/fivijuwu.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/geruwelilavaxofob.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/fogetilevebuwepo.pdfIn PDF document text
    • http://logicamail.it/draft/media/penewodaminuturazeromo.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/zekenulopono.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/12750321412.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sazexur.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/30661250058.pdfIn PDF document text
    • https://tigapilar.com/upload/files/zabaxilazo.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/nafejoxawezisesiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cinema+hd+v2+app+for+firestickPDF 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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 17048 bytes
SHA-256: 0a5f617eb1b2793db6b4d546de8f649bebde5a2148ba26d5f8b80bfd9e0e62a4
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 11148 bytes
SHA-256: 959ada7cd1d581d0b14810fcc305c468e961e258c2fe2f7ca1471516d5bb4384
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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