Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfad122aeee0402…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 07:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d9b577cc55c614ff664c54d98df812d SHA-1: 04d3189b1fff6893034c218a54b62c3ce6d7598d SHA-256: 0bfad122aeee0402ba4bffb9126931716bee214f450529f6a2ebd90068fd6e04
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cb88dccc49569039221d8af0fb462c5/viwitan.pdf In PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/goxupitomimefunudarinuwo.pdfIn PDF document text
    • https://denimder.org/resimler/files/42970639264.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fda99092f3479fba4137fb0e601af06c/botepow.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6deeab27---fopirofevikuxegunup.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb98ddf70c---barasoluluxozitivef.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/35998719884.pdfIn PDF document text
    • http://hkacca.com/userfiles/purobijelum.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb4de7018---5408129317.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/vozasuwerujubumaku.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/8005201980.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/teketag.pdfIn PDF document text
    • http://landpas.pl/upload/file/73408264737.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/42235689289.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/rimevajalagap.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wigure.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/72009587455.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083703a77cbf---88888074809.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/97a06f775afb374eb663727d0ad9079e/nivawelukedurudode.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/87l7etuplf5vch81v5qvcct9c0/lexisezifusibijoku.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/bemifej.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/gabuze.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/15926352592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=first+grade+english+worksheets+for+grade+1PDF 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_off0000b6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 10840 bytes
SHA-256: f649fd76ec66cf768a82e152825d5fd6fb161885a8dff83101ce729ab92d27bd
font_02_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 15572 bytes
SHA-256: 5cc591f7fec5fe7f9c413b7a9903475099d4ea11de10e76b62a0ea9f43fccfeb

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