Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf00c25260c6b39f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-16 14:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5eeb0dae2e2c308c0373f25fc36ec809 SHA-1: 717df32d6177ee42df7614529e86ffae588a3636 SHA-256: cf00c25260c6b39f9d1f2238c2b2d5f5f1e636849dc386694e62588cd220e10c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alimentosldm.com/userfiles/file/kokafikodusomiji.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a509bbb38d9---84062481418.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8e3767d0800c04df741691867f032ccb/84141227852.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36fdca8348---94975376143.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df5acca4337---86880584511.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/abe4ec6e0512023c8404d57e5ee8da0e/bapibadovexejojejax.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/59979975375.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c32561cb56d---vufanekaxalisugajonabawe.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/gazajibafik.pdfIn PDF document text
    • http://lactopad.com/uploads/files/52343768102.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/pezigiru.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/magisipevakutuvutedibife.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/sejaboti.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514161715_1357605771.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac902040e91---sitixoxexu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/49800883876.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e2b148f4c8bc691804da56c08f6e85fd/musof.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/ravukimamerowo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608304eb3bc60---nikuroletisiloloketeme.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/83362775192.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/giwadevudazejatera.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9310ae70---rirubugaseri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quest+definition+synonymsPDF 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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 10480 bytes
SHA-256: 78341c7bed1b9d340bb02aa8a94241f57d4df8b7796bb88b8071ae99cff2b4aa
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 18048 bytes
SHA-256: 0906f230ce188b23a2a918c2894d1969502d45f5af368fa6812415c5fdfaff09
font_02_sfnt_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1