Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00b3b96e44927c1…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 08:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 31d1cf46cbe4076539a35ec4d83d4522 SHA-1: c13e5707d1c0c04a8ee0993766b184ae29e94dc2 SHA-256: b00b3b96e44927c19e026f0d7b9906c1a4acb84b11a2593af44587a8033365eb
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kath-kiga-bw.de/bilder/berichte/file/99877733016.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/91785436259.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9d86bf33198a0c0704374eb52e066e76/97292636179.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/81806b089218d044366eea8441a2f9ea/28373364834.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/804ku9bua0op9mlctbanccc4u5/65917177818.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f013544bb---rajodugolofesufe.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a2eba454e1d276edfde0aa3852077892/71539140864.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/29647276047.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/burudeludukopi.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/45153853333.pdfIn PDF document text
    • https://aashianarealty.com/file/14494696304.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbe684cbd---49408422484.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c215be220---kokozit.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abee0a908ce---pilesuxadobaw.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/nijefonur.pdfIn PDF document text
    • http://haphadoor.com/upload/files/81474745453.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c92dc47647dc5ed54729df03e12421b7/42285724193.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ae29697ae5226609037a138969998bde/kugiwile.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a04adf7b8452ff4df77d6597dff16a69/fulovamimolojivatopak.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6bc13e12bba10760e3b53ebb9d4506f0/zedir.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/046d85ee0ea88e41c2b7472251288627/fepisupu.pdfIn PDF document text
    • http://dentherapia.hu/files/file/wopumijuzegogajowe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e7043b51---9413872227.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087432411d95---mupebirumeniguwaxezevegu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/83262506183.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/47710572453.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb179736b4f---jimiweduririzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=endangered+species+of+plants+and+animalsPDF 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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 16756 bytes
SHA-256: 4827e56219b564b5248fa0acc55cfddcd218cd22c976c761a38495ba6bf37f75
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 10948 bytes
SHA-256: cc29e5b1e800677be0803db3a0c68bc807c8fb7edad3bb138f0b55dd8c4fb569

Open this report in the interactive analyzer, or submit your own file for analysis.