Malicious PDF — malware analysis report

Static analysis result for SHA-256 184d56f94874813f…

MALICIOUS

PDF

108.4 KB Created: 2021-09-08 11:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0d46fb313ffc184430d0bc034d39e5b SHA-1: 9e1e21d3447055c64b864669f1386b9041280922 SHA-256: 184d56f94874813f4e138bebab4b5d1a50071774164886c4a66dad9831e49d55
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ivelinabozilova.com/userfiles/file/vedebefop.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/abk6cd577p2tjdpisqpjkaona4/82970534315.pdfIn PDF document text
    • http://keitbg.com/images/files/kerutusetoxoraner.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fed8a2299d8630cacdf06cff4b43ecd8/34734447676.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/48522996500.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/woruxavesukadisobowexaw.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ab206aa0595b61ae103541091b31511/wejaku.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e559b1355---nufafuxa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f1931819---zapolavuzazudanoxetukavef.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fawixofilimepixukate.pdfIn PDF document text
    • http://keramann.ru/uploads/files/98927078560.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5476585ee0---lefebabozujone.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/pajupomatozujuder.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0cdda18d3---25456925514.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a978521af61---kanokepobogigad.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/67806191809.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0103c0f7f4---16453277996.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/puxorunuvonedivibisogu.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/92170980212.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30efba828---84100639809.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/jolitujuzijixuwep.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/40777002488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=novolin+r+package+insert+pdfPDF 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_off000144b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 10928 bytes
SHA-256: 74e064aee1cd3a6480dd1111f5e9a4cfadbed294786f8538bc0455538e629e4a
font_02_sfnt_off00017618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17618 17316 bytes
SHA-256: bca30a10b93c92760266d2e66c6916f602d7a164e7b65a2825013f7243d81c90

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