Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abbf424c1fae397…

MALICIOUS

PDF

118.5 KB Created: 2021-06-26 09:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3727d76ec0bc5500a379278cc740d51c SHA-1: ba58a706f1bf7bdfe520f7f11bc806c7404bc429 SHA-256: 4abbf424c1fae397d256e960c860258e297d87e515e35c417c5521ce20707e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing structural artifacts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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://ristorantebiscione.com/userfiles/files/jeperamidezarisagil.pdf In PDF document text
    • https://migger.dk/userimages/file/50806919171.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/bivodowajurowitebalo.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/57806763887.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fd3f25461e1d14187163419ef13b362d/vawarajigasolewa.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/74865800371.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f09bdb42---kimixorerunukerew.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0c84c5a72f9efcd074f524258909a456/kafavelimufidisujo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a22e4d917---74681276505.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/96503747167.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f1f137098---vawakapopijo.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/rugururulibu.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/zemolovidajifowulox.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/35276703004.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/34833042814.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87f4975ea---xokuxasakudawiw.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xemijelumodisov.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/277eaf1db67a0be920f16daf33228db6/kofogewufuguves.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nuwawelugavolokokom.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e26e1b9be5e8c2299d31923957d9fdfb/66672826053.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc9ed09c9---wujarusada.pdfIn PDF document text
    • https://baongochoa.com/upload/file/divebi.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/h2tisk9numks1m055dsderf7h1/nodidowitefisalamik.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c58c9aac42d---12152175455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=humble+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
font_00_sfnt_off00013b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 4588 bytes
SHA-256: e4bea182c37ea3fec2363e7e1aea3df23de5155794537209ea21464df6e0450e
font_01_sfnt_off00014bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAD 17156 bytes
SHA-256: bf203dd15fd759165a358cc8c5550403bd502c864f0bb9ca2473fdda1605b27f
font_02_sfnt_off000164f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D09 21448 bytes
SHA-256: 1d1c01aef8d37b301d889d0d5f9650e1a4e684b1c8aa8d7b54646c00983affa7
font_04_sfnt_off0001b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2AC 10468 bytes
SHA-256: 67d424141fa0a63f2b79cff40c8c040627acaf91420c7c3a6192e5bb5ce52c20

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