Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdc95c176c5c567…

MALICIOUS

PDF

78.6 KB Created: 2021-07-06 22:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b301075f7d73b6959c7c99549cec8f9d SHA-1: 9d2de42fb1215426be1faa8c9737e54e4f3649c2 SHA-256: bcdc95c176c5c56763e207b9d76b7f7f9b7cd60d676be9ec4a410f572ffac576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. This suggests a link farm or SEO poisoning tactic, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://yakutiaprime.ru/SITE/files/editor/file/21272302998.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160759c40d0019---33937479111.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7282be89656443f9bf19c983706ec7bb/wijulowavepetanozafadusof.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/36282099b223cc11af27e8ca7bc97f28/leginu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef9e4aa75---xenos.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390122586f---43822336304.pdfIn PDF document text
    • http://e-sportis.com/images/upload/vanile.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ceaddf9f---61289145438.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096262ec928e---24331809828.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/bibixibusabewigijivako.pdfIn PDF document text
    • https://samowar.me/userfiles/files/jipelonunimifewozotisese.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9564ae917---21086834959.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kodenuxaxilunekejerajaxir.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6c7680c5c---68197108075.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20a867734---siluwikatapajigakapu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2b4fde0bd---65828944355.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/djl2mm2nva8k472bluhvm58c05/37097450592.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pt2jofq8ep2vto05veomc8bppn/futipexegixale.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/dibefuwaluwejevekajin.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/61155244014.pdfIn PDF document text
    • http://teraval.cz/res/file/zinoluwizemopemekurumiso.pdfIn PDF document text
    • https://soechi.com/userfiles/file/59375730611.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/bd4068a5da92ca5c8e59c1d3020d1363/jekijizisepifomim.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f102d69aa9---zakabidamovoge.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sogobizupemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+convert+pdf+to+editable+wordPDF 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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10728 bytes
SHA-256: 5c5533d7861e3a8baf6c04c2e1c342745ee38d4d28b64e581920acce8730e5d1
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16452 bytes
SHA-256: ee990636979500da4b11e05e68a3f5c5b089cde31063fc65670314a89246a3ad