Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8dd23dac70dbaf…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64f7319ab1b027b71b36e14cdf1b1737 SHA-1: f7fb8b1782cae63261fec3b29807fcd36d0b82f6 SHA-256: 0a8dd23dac70dbaf206106c3eccedc9385b50a36af106d5036e229e30f681475
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs pointing to compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=linak+desk+lift+1+manual PDF link annotation
    • http://gidaero.com/upload/fckeditor/file/dibesematakunuxilifiduta.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c2f1ksk34oig0kv337jkpr1oo0/2205879106.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/43cd6b9d39ba2163c996d953a5f47053/16387971510.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676af4dc68---xibisux.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/19v9v5sbm312f8mvfeicurh8si/waxebedubarafibe.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/opikojibefavoburefuwo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611de2d6a8e7c---zekobamaju.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bofunufimemuralaxupenaku.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be2862c4ab1---xifijegupiboxojararebuxox.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/savopusotidabejiloxowake.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/xozewuwusumujasaziseju.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///92660174393.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/fulaladudurarejasepe.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2850ecae0853e8fe347c0b8cc9c1df68/digazotakonek.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/em54ol3l5ip4i0k4qatrgvm3i8/16892973136.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5pe3iqrrf1v2bri3kt0us9lvm/20710605776.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd14fb6331---11965354924.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb272b8ec6---13713232827.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/13965328506.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cde9bbe53---tulodefeviputitefijukup.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/mokaredufemeroxovoku.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106040535123964.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dee3385dd---lopakuvixenem.pdfIn PDF document text
    • http://poiskvod.ru/images/file/56173740065.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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 16208 bytes
SHA-256: 8b66b72d01b0af720528e92cab92df1550904422bb0b6dcc648db58dd4233dbf
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10496 bytes
SHA-256: 4fa3c8b63851e4dcc95ebfc5021a81db83ce07896156ca32699365459878612a

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