Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02f08046ea3462e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 01:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6b36178336a8b3702375edaeaa6d8aa SHA-1: 23e0ecb8177fb5b350d4ecb49a4342d5015937c5 SHA-256: a02f08046ea3462eb48d397c42a449592ca04909d804c94bf70dbee65979aa3c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tavio.ru/files/file/16680004214.pdf
    • http://tscyw.net/userfiles/file/20210727210817_hl7smc.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cd9472bb---40371035456.pdf
    • http://generaltubi.com/container/ckfiles/files/38827418636.pdf
    • https://vietspices.asia/uploads/files/dubelepewezazudivosal.pdf
    • http://nutrisoilvietnam.com/upload/files/judipipumezatedeji.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e3264e58c76e532e2f8aa6bca369bffd/zekeki.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61b92850---kuxekugubetibiregototat.pdf
    • https://grupahatak.pl/admin/_fck_files/file/zumoxobobonujodusofu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087e875772bf---gozas.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/41223452899.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/da8aa58ca2e9617fe210160e65ea13cb/73818500361.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/supelutopusutebufa.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/30eebebcaaa93d557f34e9dcef85f19e/zobowini.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0868c364---24487439456.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/290a7e747f155472b9fd0806fcea7b0b/lolorofepuvosafifuwa.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/87f52248e6e17d74f6857bcdec244c67/54213492618.pdf
    • http://music-summer-courses.eu/upload/files/vigifukuluz.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/vidutubijisut.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962646e5d94---motefazasekiwaredazoxupi.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/munujimejifenepudilawa.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/cnpebr7qnv1et0j7lek9s4j1m7/48323351588.pdf
    • http://professional-tuner.at/uploaded/file/kagavopolizox.pdf
    • http://breakevenpoint.pl/uploads/editor/file/19259632511.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbee81a28b---bovozaju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=makalah+antisepsis+pdf
    • https://doi.org/10.22435/jek.v19i1.3146
    • 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_off0000f39c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 16792 bytes
font_01_sfnt_off00010bb3.bin
3bb114b7a7436547eff841e0de6af845b0be0840afd4fe081917a70620712b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10460 bytes
font_02_sfnt_off00012356.bin
168bdd552ac5be5a38c72d0cf25b77d61c083fdd2d55e03e5e5933babd987d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 17984 bytes