Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53a8b5fa2adaee0…

MALICIOUS

PDF

96.5 KB Created: 2021-07-04 22:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 48a80c7b2c6821cc864613f59fb09c22 SHA-1: 43ddba7a3434b66d2341d3acd0b614848303219e SHA-256: a53a8b5fa2adaee0db1d8be61976a27977a9744ad10a4fda5da69b767620aa64
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content or phishing pages. The presence of these links strongly suggests an attempt to deliver a secondary payload or facilitate credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=what+do+you+learn+in+robotics+class PDF link annotation
    • http://halaljones.com/uploads/files/birujozaxetum.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/26020246433.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/hjev1tin6lds1ssncp208gn6m2/wekikobupafurekixubijut.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6b0b20997d01b63ff6ff7694ead14e5e/93884757725.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2mbdeaqujqk6mvn326iptrsalg/27614799637.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f4jilu5641mi5b34u19nsdmjlm/8336988652.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/08i0eqe3h7pbc0hmta6jitqlgv/nabizodavakovigagenupilix.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/16d688f147b1c5f6c9a32de784c03394/megog.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084365940442---76321226037.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d79dcd5a24bbc3a25cbce6646bad20e/15815570192.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/44024602708.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/vakudafole.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/38995ef38ebdd02fe5dcff2a86729abc/60820305930.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/tawulopelezinisaje.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a1bd6ed7---zukelobelodufepo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eab90c38e---11603878945.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145ae7a2c5---33254130676.pdfIn PDF document text
    • http://air-ned.com/uploads/files/9121673609.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/kutozerezi.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/modevibosemusitevuwidij.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/534g6dj13i6jbv9r76l340km72/91450060865.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb7a19431---91041341904.pdfIn PDF document text
    • 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_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 10816 bytes
SHA-256: 894b1fbefa90a25efaf4964c69956c2709024ff414b83593d8af77106d32a2fb
font_01_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 16900 bytes
SHA-256: 9db7ded2c72e14fde1a9bb7bdf3e729852f12b13e545ce9069f27bb7321efd6a

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