Malicious PDF — malware analysis report

Static analysis result for SHA-256 2697948ca9123af8…

MALICIOUS

PDF

101.1 KB Created: 2021-07-23 02:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2caa6109ae7bdc0f6cd7b7a877f10a5d SHA-1: 6d867a1dc6af744d99ac77d6ab9b78c785f009a7 SHA-256: 2697948ca9123af8cb550f0025a39bfbd5caaed150a5b7c50bcfeba0ecfec19a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c352d07b---peweviv.pdf, are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7r0i1hl9378dt9lota4dqvlet7/35497597512.pdf In PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd86c2e210---62426775079.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/goxalodaxapevudo.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/megetemevevexiwof.pdfIn PDF document text
    • https://fallsplat.se/file/55647629667.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/vunegewipukowule.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b83aa2f6da84a3ee57a946b9e6aa7414/pajozobizexogedagi.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/rerokabokezomirajobagiro.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c352d07b---peweviv.pdfIn PDF document text
    • https://belloverde.net/emailer/file/80837617483.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/78474100183.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825483789d1---veromivogakababij.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8b892635ad9fd2ab7370379c30d8177b/82990002424.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a8d23516---xuzalulitexo.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ac1fd19cb769aee9747876a12679393/19695117674.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/97511999235.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vamezafewa.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/42987860013.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c483ed6a0c3---16129345159.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/dc7e9611a74e7461a6ce91ec839650cd/30114506752.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef4bc45c1---29831853206.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/50a0f92aff0ea90a1d5553201f57f07d/31236081072.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/negusafefapukuzobuduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+harry+potter+and+the+deathly+hallows+123moviesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 19104 bytes
SHA-256: 392226427fe0ab80b92b956378577723ea723ab2fd0d6331a678a5c8be871fae
font_01_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 11380 bytes
SHA-256: 5580652c6e5f04ab881ac324e3696e7f76727ac07b56962ab131181c9427c257
font_02_sfnt_off000152d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D2 16732 bytes
SHA-256: 8d839163a044c5a229aa92abbb3030be13840ad39a79f32dd9c29cff439fd2db
font_03_sfnt_off00016a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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