Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2355c46d8318f1…

MALICIOUS

PDF

88.6 KB Created: 2021-08-09 10:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59c29001072452f03fb66acbfba9a233 SHA-1: b14ec32d31f5ea09e37859dffbbf216a02778252 SHA-256: 2f2355c46d8318f1aebb63bc86ac44824cec6a0a7bc991dbb5272511b89591f7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://klefmarken.se/upload/file/vudav.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/baximowipetizuwef.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9047f62805---56363175705.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5f0391eed8fe491919520b7678ae91c0/vebevedizizumibusas.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b95c3b676---dunarorotipaxesina.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/41655053647.pdfIn PDF document text
    • https://migger.dk/userimages/file/gaxonobisiperigurivulur.pdfIn PDF document text
    • http://www.siposferenc.hu/html/rinanezozife.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gudovapigozonopebunepeb.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d6f1360b7d5021b63f472a37ea66cc45/riviputamusobikigewuxan.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/83731976439.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbac7696ca7---72686275719.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wikedabiferoxeramizebixa.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dna0nq5qbdplf595d8v2fo6tr4/zajipevetozukelifewadezu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/23418792ab25c9e03416c999e081241c/51756197200.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/21c0577dc128cf40d5186c465d21e601/ropijewajejunanimamale.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/logazogejabazako.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/dezunexekipugebojomukos.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077450f0381f---91107627829.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/pvr5ajtq8qe931as54dn8jsh1b/68585131662.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/nexukatibanuxu.pdfIn PDF document text
    • http://armanetti.com/images/6539492722.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a22575998---30012535534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bollywood+full+hd+movies+free+download+2019PDF 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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 11400 bytes
SHA-256: 539ac6e4788dd1c10e5ebcfdf89d6412174d437d23e7b29db757afa41ade6a47
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 17284 bytes
SHA-256: 75d0b345cc352cbf7ccb1d206f1071f47024dfa647d6b1d78b18667c6cd0c4ff
font_02_sfnt_off00013c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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