Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf6ad4827ae3d28…

MALICIOUS

PDF

87.1 KB Created: 2021-08-11 14:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e44477d2580e02be57534f15f89f5bee SHA-1: 9a42b845cfaf7859f47b0d89d9d4314321a61f3f SHA-256: 5bf6ad4827ae3d285b6571b9fb254eb8a37c2fcc07111e3ed53fa93f4a7f1ef6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f98a570b7---47037153857.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc57025800---wikovijaru.pdfIn PDF document text
    • https://efnnma.org/files/file/xewokifuwijipugudotanos.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04f8a3b68---8008024740.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/zisemonesisivagedadaxubi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f673cd4f9926ddddf91daeadc457f7a2/3815852954.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/xusejosemaxonobilonibavi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a60156e6---18781823080.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ton5r9cj9jdird90670j9mmsi1/sofotibuloripu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ce678dc7d5c---jabufugarafaxilofidofivu.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/betatomoxeworavalajivajek.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/7552063470.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/78787565588.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02cc3957b---4305309744.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ddce8184---93552151731.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/o3c40pavcefp383sl2h4urp6bk/kerekepoxozibunij.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/kekakatu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210803065237.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wisata.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/73854977005.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e24e74bb135b52b1053a7a7da100b5ee/xifufinozonodapireliw.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/67134808130.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef7ee08482---gododakok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unjam+a+swingline+staplerPDF 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_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 17052 bytes
SHA-256: f236716bdb8f9f6ba5f248726d504e61c84696e11e632e8ea4f0630fd9827f1d
font_01_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 10904 bytes
SHA-256: 8ad40830199aeda1aabf55bb86d51bde31c8458c45cca9033d8138a1413d7a5e
font_02_sfnt_off0001356e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1