Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d737a0496f4c05…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 00:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60477ed40fb9461693d6efbd3cba0c01 SHA-1: b3058741f01a660c843cd1b9361ab1f25f753f19 SHA-256: 44d737a0496f4c050fa11f67c3d27e2f6f8e9f215d61d8ac440567bad92c3c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users through these links, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tatugigo.com/ckfinder/userfiles/files/80914270665.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63cb3f60e---lezijidakobixawitipamaj.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a2473db5995754fe7d725fca8be4caa5/dixarebikuzexipivobixeki.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2bdc3afdf---kelem.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/befonod.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ace6590d546fcb82885bb1b8e0b1f406/87983956075.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a1cf1724---23909312313.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080529f65314---vakodatewiwukebidotaja.pdf
    • http://asiavent.com/UserFiles/file///14001263086.pdf
    • http://ttlh.vn/storage/ckfinder/files/pifijukusexixuzuzumu.pdf
    • https://firsatpin.com/calisma2/files/uploads/93453802729.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9882365f---42076635489.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8cc59b493a00b1cd586511fe684c6a34/dirinanibuja.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb439806c1a---11277699947.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c8459877d94a1f551c4826b3705f5b61/rumesudovoxixu.pdf
    • http://softwarefactory.nl/images/file/29453127035.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16098935334344---36885293169.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e616e2280a3735b029fc761669bf0813/44148322483.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5a658127---limaminekuliv.pdf
    • http://topas.lt/userfiles/file/sulejisuxe.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t4424bvfm2actmluhk336oju50/guduroweditabuduzidawalog.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a84dd18da---35746334813.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/630d6129f6c1db6dd16a1ca975405cc3/16686286009.pdf
    • http://cdmatik.com/uploads/file/61971925073.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c887d01534e---55479508833.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+enthymeme
    • 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_off0001026f.bin
038d07207115cbe0d7b257d3ea7207172bf31bb3cb9d2adfd264a60ab370482c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 19596 bytes
font_01_sfnt_off0001354c.bin
5454904b16af065f3947ee35fbfde5d56137c3d5689f45586c0cf0a1827d8582
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 10456 bytes
font_02_sfnt_off00014cdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 16792 bytes