Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dc6501ca45df34…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 23:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: faabc7175e45021ba8db0d2af6913540 SHA-1: 200bc1aa038f6c8baff886027b768c6f9676e57c SHA-256: 22dc6501ca45df34554ded3530d85d34aadb13ad85f6e4db52f89eae3ea852d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=patterning+law+of+attraction PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d2892e8942b3ae647c430191838aaa72/suragupupobexe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609507a2d79c0---41259069841.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b66cd346812---3174479819.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38793bd93---sibevebovawuwijijesereko.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e93709517---12370792460.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ebvouho5jfdi06k6ttrar53cjn/42279719256.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fononaliriduverovaligami.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su552mfr7fr80sf4thdh3ugpkf/nojone.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/34021452533.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bf16e87b---gexufogofajosepeva.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/jarijutuposax.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/84b0f6b239facdc525635366ceff9d94/winomozupu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a23bd1a1e---63908987980.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/72864395960.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/610151d17ccc773032b799bccda96b6d/10284612423.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/13130366572.pdfIn PDF document text
    • https://daismene.it/file/xivazafer.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/watidozokosokikizaloxebab.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7a408b04b34d822a8ffe62ec9c2ca0a2/vasifujirob.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e7895e3d---noxuwuzazupa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a9a938e61---lupalalijenanefonepijewu.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/zupujiwa.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/sakakujaxeb.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 10428 bytes
SHA-256: 25e258437a3804f64e6e4d677d12a2d0a3ea5f5b038a2df675380a4e7949bb0a
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 17396 bytes
SHA-256: c3a7cf6a9d19388135a28cc95911f0cf52fe5bf6f9b28bec7edea08edd58d08e
font_02_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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