Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9baff82efeb813…

MALICIOUS

PDF

78.7 KB Created: 2021-07-02 07:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c746f2cf786ab668a77439e620d7cc80 SHA-1: d0b1f340300e7e6fbdc939dc54cc0dc51d81d50a SHA-256: ae9baff82efeb8131b7d0acffac6c5628211e9b7d0a45b2b043f766399aadc9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=pedicures+and+mimosas+near+me
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/170f65305531f9733f3fdcb8c007ace5/zorewuxudonilesisivigu.pdf
    • http://feach.ie/images/uploads/file/wepilefonegijisipakupid.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/653fb2e65a5b656095e7b2602c68fcb2/10026114111.pdf
    • https://camping-du-lac-dijon.com/fichiers/15285217850.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nuwedifimetazuzigar.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/elhf4di92polkrm1f40uhggq30/doxox.pdf
    • http://jar-ted.pl/file/gufegupadavarunazigibi.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d321692ca8905595a4c772e32f76ac58/69366239766.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/gijugimufadakazet.pdf
    • http://ahkjt.com/upfile/file/gimizaxajamunipesezuz.pdf
    • http://bclgrouptt.com/userfiles/file/relutevukovesavokopuga.pdf
    • http://dentish.ru/ckfinder/userfiles/files/nuxamuwevaxifaj.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160760569848f6---rikiva.pdf
    • https://zebcom.in/userfiles/file/numaziwodal.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/gimevexugimopevik.pdf
    • http://maynenkhiinverter.com/media/ftp/file/78529095022.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33cd85429---84269498504.pdf
    • http://armanetti.com/images/22000319211.pdf
    • http://mutitar.com/user_img/files/kokaliwodaxuwonigebo.pdf
    • https://rumputhijau.com/contents//files/sumokijixebimekaxu.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ac5b55ad5824bae671649840b7dccce2/xewokolagavefopotisox.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f849da2ed5---5198235575.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/jiledisewabisato.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6eed318bd9f560619f1507b79324d8de/60553686909.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_off0000cd46.bin
36df89cd4810c3545f5754404cb3e754eba6bfa54b7220c5bf6ee441d9961609
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 18196 bytes
font_01_sfnt_off0000fd57.bin
885d4eee5ee93fb095f6d722c7abadec89bb8d66234f1c51fd175877b3dca8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10488 bytes
font_02_sfnt_off00011526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 16792 bytes