Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebbbe506b1666fa…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 23:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: df323465e17aafede1811cb39854f962 SHA-1: 19cef7a4d53100d33e0bd42db0d9ea5c302eeda4 SHA-256: aebbbe506b1666fae6cc5f17d434ea2b240bad2cba46c9396692902908eb25b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. This behavior is characteristic of phishing or malware distribution campaigns, where users are lured to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=marshalls+store+hours+near+me PDF link annotation
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/9881458627.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/795118ef696f033ee36838feefd70392/kuvop.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/pebute.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/94377711586.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c986d74875---58537312377.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b04ac576---pakaduwi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d7f37322---rudoxapojisixomoziped.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/68130727760.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b366b27c---ruzoporutigila.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/smdpaemm2dmp0fdii51ms5je33/wamukikelusimalexon.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/64754425105.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/12690519469.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/264e85d9c241e6bc1c3d6bca09b9226b/dibasude.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rusujepolu.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/rekemezape.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703816c57d1---bovavejaromexafisasote.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/148907f3ed491984742f171569428e09/50635425193.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160945db50f6eb---67518383391.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609382496073f---pavuvat.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/71732423925.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16081440b25630---72149445240.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ea010dcb74f2d84cb198942c0a12673a/xozilezebuw.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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 17332 bytes
SHA-256: fa5c86551579d5110b94ad284ca6cbdf1b3c88e83e5396c1c011ffcc37d48bb5
font_02_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 10376 bytes
SHA-256: 89e2fff94e4bce03a29a1e82ed7dc2be3bec7f27dfd26005e92d9d2b397c73e1

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