Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62cf15b2634dac3…

MALICIOUS

PDF

88.9 KB Created: 2021-07-15 21:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 332560278bc67107d80765e2906c2b57 SHA-1: 682cf78408cc6631d31cc37f81ec52e75d03dc09 SHA-256: d62cf15b2634dac366ef006432f291a3b059fbeaeff8c1873f04192e3fedb62a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=no+sex+in+my+marriage PDF link annotation
    • http://accessprecision.com/userfiles/file/belumu.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/65025082420.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/31500348563.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/saxip.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92d0d0623---95857490463.pdfIn PDF document text
    • https://vientangluc.com/upload/files/putose.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/jezepupinubi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tizaxofiz.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bfsc1shuq8fsvh12jjrrvf04bl/jevikefugodawukekozokisej.pdfIn PDF document text
    • https://patc.fr/imagesfile/nonasora.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160760b309f6c6---pifofoserozol.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/kipolodarosunenexeriwenif.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ed7e8a70c55eecf1edf0050a7b3a43a9/90059365198.pdfIn PDF document text
    • https://aokman-drive.com/d/files/tifejurivubukep.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/15639595279.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/97199388115.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/disewitodugipewim.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743978933f7---doparotuv.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/gadobesukinuj.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nosulugesogirubiwe.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/pimumo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/91enaoeikgnbni92tlc1qe1dim/xixumilumevigepujalafob.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_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 16520 bytes
SHA-256: 7beeff89ea19df7cb1335200768448a63b814026cd36d5d46580f08ff2bb63b0
font_01_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 10500 bytes
SHA-256: bca73686df74143b02b93b2521f584038d0b05fbb30ef35195e97972104c5afe

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