Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff6c4399a73e555…

MALICIOUS

PDF

73.3 KB Created: 2021-06-29 05:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0d1812d602095f9fe592ba121190dc3 SHA-1: 1cd12de9679699b21ab80ae0bfcc12a26120065b SHA-256: fff6c4399a73e555b28b0f834e80d1f2403ba3a7979c2cfc3df4908fea47a8ac
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=abdominal+pain+in+infants+treatment
    • https://n-zvuk.ru/upload/file/98280781337.pdf
    • https://fonixkoncert.hu/upload/file/56794994603.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607efe85429b0---pafekusesidukavebax.pdf
    • http://pensionpoint.cz/userfiles/files/27370419725.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b81df117c---95746778869.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd814554de7---jikegakeropeno.pdf
    • https://gujaratisamajparis.org/upload/files/53479905829.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3fe7216c---ragutunadiviwizawofise.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc06b9d2ba6---3831138111.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4c28312f669148a4f559fc7a6b446775/jodumejariralevakazof.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ketua9kk541ocganasdp2tqv86/66132792726.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160824c22a2af6---vakadixumaleratabilo.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/35a4d59cf3c0d8677a7fb756437630c2/85619694436.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b2f905ed---66507669988.pdf
    • http://kyanite.tv/userfiles/file/55563290027.pdf
    • https://fokusmedia.com/images/uploads/60638203594.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a82157e84df---xaboxekepowogabiwamixib.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a407b12835---forugitigo.pdf
    • http://tokyoracing.hu/userfiles/file/jemivelowidewofalos.pdf
    • http://hzjksj.com/images/upload/File/tawalenud.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ceek2udq19tg8fuj8cci31h8r7/40730251728.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/a0a8942a1524f843d1313e5522516495/94417413670.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/taxunofimibirogitizurinat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf89.bin
fea208c9472694f2f0e2f7e06416411b7b5389efed25664a69701b92f7536eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 10780 bytes
font_01_sfnt_off0000d817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 16792 bytes
font_02_sfnt_off0000f029.bin
d467c9adcb234cd09d719e06ff944fe839ddb6cbfd6f45e0555815b24e953c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 15560 bytes

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