Malicious PDF — malware analysis report

Static analysis result for SHA-256 93621bba988e1299…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 13:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e90e5107e130fd0a66716a2a6860f7a8 SHA-1: ec079f733099516afa18f297f1457c21cd5e8145 SHA-256: 93621bba988e1299eb5c38123290c6d095d3eaf5c30575edf675d0e29bb7b467
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV both strongly indicate maliciousness, consistent with a phishing or malware distribution lure. The primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2f3i9o5lbo65np7p9ob6p64o4h/5663562610.pdf
    • https://cornwallstaffagency.com/userfiles/file/butes.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce127f168---26314111667.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f38b2ac4b97---rosupugakugetuvate.pdf
    • http://aftckwt.com/uploads/file/tivepuvun.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/29293235220.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b7896b578bae377bd92a2741e10237b4/vikevefipevinivisoko.pdf
    • http://soflocops.com/clients/67403/File/tamadujofasexosud.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/sikonuzaxikixejexili.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7b186fe7---xavunifugarotemefekisa.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6722554069---64790613741.pdf
    • https://nmg.lv/img/uploads/files/83361481296.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7js73g86ruv62aqpi06fha2gm3/wotunikamubogel.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082feb902d94---gulumasiwufo.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0e0b9541f7368e2f634adbfb002d6b1d/wunovatudedipizakeku.pdf
    • http://studio5r.com/userfiles/files/71909076477.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79691dc51---raxaxasedasiz.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/38468447527.pdf
    • http://ahlhy.com/uploads/file/290310004706.pdf
    • https://dovolena-jiznicechy.cz/uploads/miluro.pdf
    • http://hawks79.com/clients/85064/File/51231189998.pdf
    • https://cometsecurity.in/admin/userfiles/file/gowirifezisu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=video+star+pro+free+download+ios
    • 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_off0000f811.bin
bfb560bb834d09ee756e2f042329f27bccbeb395959b0acb8743daec6c566d51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 17336 bytes
font_01_sfnt_off000125a0.bin
6cc1d376000df0bf7b81811630dc23863b00d38850b465cc9932e5b79f30ec80
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 10548 bytes
font_02_sfnt_off00013dd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 16792 bytes