Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f98f4c4428e4a7…

MALICIOUS

PDF

105.0 KB Created: 2021-09-05 14:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cd65c391c3b44d161e0502e56fd2480 SHA-1: 002c4091182af15e965036b6dd833cd59330b6e2 SHA-256: 07f98f4c4428e4a78cfebc4a58883027b8fd73972891b9f425a2f785bc97d031
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=theory+of+reasoned+action+and+planned+behaviour+pdf PDF link annotation
    • http://kenshopvn.com/uploads/files/gugurafuz.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/49658156698.pdfIn PDF document text
    • http://pedraferro.com/files/files/loledu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a14fc7b1f---furamodorupi.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621204583.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b64053ca40758ebcdb6d17184ee83fe6/35068797392.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/54579681529.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/53998811905.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/vodimarufodeji.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8279d40a63c82d0355502aa7ad51aed5/45897633789.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf13b7592---fudixi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fcc1a222c958d3248fa494cbfe08c0e2/tozotigodifude.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/tudowarenaguxanufupod.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/dozurogufonekupale.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075231f0aece---wasoroxusa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e336769777---vikezema.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a6e549c0---kavisetobonuzafonivobud.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/68129155858.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/tawepujinomokeka.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/derepatopamiwawuvonuxuji.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608983179b3aa---13604957049.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb565df61---53172628502.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8550d4803f---47236366289.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/09a9f2a1fd427542745c85ba8f03fcc9/kigowijavalapur.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_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 11100 bytes
SHA-256: 04d61c2ed6a9f07041919429f352efb0579b255ed4303acde112a25279f0a507
font_01_sfnt_off00014aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA0 19436 bytes
SHA-256: e0c37db7a808e03932a6594d29bf3b2b3bb7bfbe8a297ffb06c1f430ef91848e
font_02_sfnt_off00017d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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