Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8e646c7bdcc804…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 15:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f83f37404db846991a3c15f18a188b65 SHA-1: f9b8a9e9f5037b4215c5880ea8d8fe4b3869022b SHA-256: 7c8e646c7bdcc8040cf3cf450bc2fbdff94a41deff7e83bc23ea76e0e86648eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt designed to trick users into initiating a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fevikexig.pdf In PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b0528ee7843b6352a07191b8cebe30b7/56558399709.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nakotafeturawewo.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/28456799180.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb847ea325---bexijilazifolulevu.pdfIn PDF document text
    • https://yuktogel.com/contents//files/jobamawuvugogibizoni.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/57866667642.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/bbc6a13651ea04350c68d761bed2d2c2/feroxijisalasizu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160848d4755086---xasonotonevidoxinixozene.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rtlkp0nfbvf821ah6nv93jgdjd/muzixi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/12922261955.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/ferox.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611af25d5b8e3---34220353422.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/tedazediludoxewakasogis.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104b3949e3ee---75481125172.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e0be47cb---jemifulesinisusizinugufuv.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2e5f1397---8093584359.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/mabipolukufevexeri.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7aaf219eeaab6c70d35a0fba5ceeb80b/35036831437.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/lobejas.pdfIn PDF document text
    • http://standdominica.org/files/files/duxujosoko.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/28761361837.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0bd519a8bf263fee8a9441d80204ae4/dewivadunobusolepej.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6957eda51a---39288191901.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/33335882232.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/91136500007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+timetable+templatePDF 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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 18184 bytes
SHA-256: 8ca99d34d7730ded0bf1e1dd4dd0a9bc032344d3c7c1feb220c788e9a3a9e836
font_01_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 10308 bytes
SHA-256: a9e39b57547d307b59d536b426266fea2b50d91324b67914a86a75503610b5c4

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