Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1ae1dc83a8c09e…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 05:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bbb1d3a15e3b03c7d3ac8850424e73e SHA-1: a4b3b5eaa232bc0232113086f94f23e289cf5c24 SHA-256: 6f1ae1dc83a8c09ee5da00a5b0307ed5b5d22584349c8befe3691dd56c60af94
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://powermailer.in/userfiles/file/doripid.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/68bdd71450223a34b5b2a34d1978af28/59346206204.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/doziropovit.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bc771521d---47697267250.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac9a7d4e9e16166abbfaae40e3bdd4d2/68455687313.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/97606215272.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78d8c6a5b---69086710658.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d23df61b222f57e167791dc3c7d6c2ca/56435767353.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/990bdb945ea20576c3b43f3d6a7c668c/kibegigijul.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e407cd05e8---44541337415.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/zujapuruzigixatezenopu.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/68233702377.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/wasasazoriwuvemukojon.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zumewoxafib.pdfIn PDF document text
    • http://atiksigorta.com/files/39449573689.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/71106663851.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vipozavun.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/55036435542.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/19394933454.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb3abdb47---64457717136.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/61677177244.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/javigojifemipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+time+does+odsp+direct+depositPDF 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_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 16976 bytes
SHA-256: 2b2285017205703a4e52d1256af6920aa3923792aa35b0de8e50c193316b29e0
font_01_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 10620 bytes
SHA-256: 0e04b54af0963a5666ba0a1969ba90b4f84974c2ba895da786c8971417898c17

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