Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a3c398a116c13c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 07:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22ee315f991e687af7fc45879d443ebb SHA-1: cb140d7594b6be5d1017c3162d60d55a0bd525b1 SHA-256: 75a3c398a116c13c72f6cba22f2a744ed592d5c950a06304f238e02d4d415951
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=twrp+bricked+my+phone PDF link annotation
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40551873760.pdfIn PDF document text
    • https://ghnservizi.com/file/22206224095.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/213727121961386e1403943.pdfIn PDF document text
    • https://petikdaun.com/contents/files/10971516579.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wopiwoworumogibi.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50059317203.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/pasot.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5148b7d1---bawopefemewugudiwofumulag.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/xakabo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/sofavakamemamutibilig.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/favisixexuli.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/kubibipuxuzo.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/12491728156.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/26190791377.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/pukoxumesiwizamanurid.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/kabupirex.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/09d94416fb17269c61086e5fa2bc523b/1349031932.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/xafikofumuwadu.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/26009533206.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/zagurovapezudotopejamez.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133481eae5ad---xurakatusavusezapo.pdfIn PDF document text
    • http://baoveantam.info/upload/files/pevoxerefimajewi.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/49776910164.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143438cef039---41372503338.pdfIn PDF document text
    • 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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 18012 bytes
SHA-256: b56d7f91eabe2ddcdb0e9d7950ad7d6db66d0b5c3e9f1d566337b757f2dc2e53
font_01_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10700 bytes
SHA-256: 38a29d82cd0f06587daf2accd491f91ea79b37692e56db1c780a8db243b0a25b

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