Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bebda132641a946…

MALICIOUS

PDF

95.2 KB Created: 2021-08-11 02:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d601cb0a865b370257d9dc1204ded752 SHA-1: f5b04d333dc8bda86b1efc8ccb5750697a59a170 SHA-256: 8bebda132641a946effa4f029cd2a74b7ebe09f843dda0b5c787b620f6077b85
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users into contacting an attacker, likely for financial gain or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a7841892ded---64696213809.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23da9f1ba6---rotufikabinukonuvodixeme.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/vapujawumatizosipeko.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/virokimomorab.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742b7484b59---kavuxowukuvuxowo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39910b046---zerupesopami.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/kusimozusadetudubozapele.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c26ac30faeee40f75867ff94357e30ed/batasaxit.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/2730416297.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5trloeel0680kb51v0c0hr1ok/peneroxuletanoxiza.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/27110894936.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/vudoxivedu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef40981525---6178185373.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f7fe0bb3---gubipinevadijagazetuxu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/30f3abb61f2b2ff83298fcedaf7631d6/gowowutojinun.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/63976239369.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d9b4b1de---voses.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b335987f3315258d643669a4c5ff07a/67252735063.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/pifosasevebujukisugumasu.pdfIn PDF document text
    • http://zae.me/datafiles/file/tubigudufek.pdfIn PDF document text
    • http://indecomavo.pl/inc/29773903597.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ges6rcdums6aac194dvshr4n2a/zipogatebasajuxobapurozaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vodafone+call+history+of+prepaid+mobile+number+without+otpPDF 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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 17788 bytes
SHA-256: d52d6373af270c7722cd6c17dc5182857475f3acc821e159613e6c8122cd6066
font_01_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 11296 bytes
SHA-256: fe511792cc99a045178f0a78b040c428584d3d478f906c534a739e4ae207fc75
font_02_sfnt_off000155e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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