Malicious PDF — malware analysis report

Static analysis result for SHA-256 3989e88401a5bf95…

MALICIOUS

PDF

101.1 KB Created: 2021-07-08 01:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 09567a2ffcdfc7aac0329164901ef2d5 SHA-1: 39fdb15f9b5504f0dbe2fb5f45cfe291c96905fa SHA-256: 3989e88401a5bf95ae41f53c17ef73641ae6b36086f063cd5fb4914fe6f4e91a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://abwingscolley.com/uploads/files/47397350738.pdf In PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/57306913404.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/32c4a5949d22ab1b9065b7a7bbc8726c/8549261369.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fa591ecbc10bac1a24327c3f1a6145e1/23468986648.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b4db5bc21---89326680086.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160be86597cfbe---godorolexojezolonibu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5cf66af8861022a13a5b14cd68719887/lulowademujepilib.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/19348011869.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160878532d4dc7---12732812871.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3728c67e---pebufug.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5e677059---serogoj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d932b3a4a8---wosawetimed.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b612067bb---12391759672.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/bofel.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/nenaxekekaz.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada181f8b1---77887493542.pdfIn PDF document text
    • https://marosme.ro/hirek/file/duxeronatogopalirozi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd531e5a0---vajotekuziwasesosa.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/62a4f3d301ecf67b5ace96e11bdb11ce/zavesudivezeniwibavosa.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/33878010954.pdfIn PDF document text
    • http://adveotec.com/img/file/pewepamajasusipeterajuk.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/vojiragamex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=annulled+marriage+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ff32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF32 18764 bytes
SHA-256: c5dc43ee34ce3d72716f081fb04b993a8820469c1d72823538ac0beb05c5c157
font_00_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 4456 bytes
SHA-256: 451232e2173087430d038a6cad98ec30c48ff1c8e2188316a148153163f454ea
font_03_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 26312 bytes
SHA-256: 48db170cc5d57fd30c8b34fbf3557a71933cc2ce7a4138fe7146c5080b1a593f
font_04_sfnt_off00016ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE4 10556 bytes
SHA-256: ef12056ef34832ad91a8d2a63a2cbe712fe510354648db27479f2632a2fc5d8a

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