Malicious PDF — malware analysis report

Static analysis result for SHA-256 982aea9181fb3b73…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 14:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19d0ae8593877efbdc6b2a7ee4b4d0eb SHA-1: 852aa0a2c84d57918413acbaf2f6a1a060fd7d81 SHA-256: 982aea9181fb3b73a084e67c413666df59bc06af91ba6f65c04a4510db1751f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://marinda.ru/pics/images/file/98903988119.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/6e55725cfd391ffe1d8c76dad99b6e1f/kamoneba.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b2b3d245---39443847067.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e74ff405f938a98a732376c719bfef0f/lobakivov.pdf
    • http://vmkmsz.hu/userfiles/file/26230429561.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ca63bcd4f6f127707b95714c4135c2e0/nuloxapasibufowidazoju.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/38998797978.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/896q02a3ftkei28nm1nh1gdmi1/8269619284.pdf
    • http://kursadowicz.pl/Upload/file/73505175962.pdf
    • http://verynailscm.com/user_img/file/73415698589.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d4335f62---kuvobofawusesigepu.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tapomugemifarewaxezilo.pdf
    • http://immobilier-valence-agen.com/userfiles/file/33284489351.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6761e603---vegotalelawisagik.pdf
    • http://asianmosaicnyc.com/userfiles/file/zumamanubonato.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a9426d986---migagaragudizovemumuzipis.pdf
    • http://mawaevents.com/uploads/file/85993675213.pdf
    • http://hms31.ru/img/file/zexeju.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210825_DCF39817284ADFED.pdf
    • http://diysmart.net/userfiles/file/45611389008.pdf
    • http://xpressup.com/userfiles/file/87706090550.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d956da0602---zakivubabosuvorifi.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/wiwugikixe.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608236cdb9323---welakuwirebumudufuwut.pdf
    • http://altelaw.com/uploads/image/file/neseko.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/88294884558.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=latest+periodic+table+of+elements+2019+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000d904.bin
b3287fee3e369f4caf365a26404bf7f8b3316c415b1bc36cc3608dcec489711c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 17720 bytes
font_01_sfnt_off000106b5.bin
f1d2b8417cef96082401c0c0403afc4018b504b855efcd8e315f3be40e3817ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 11340 bytes
font_02_sfnt_off0001212f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 16792 bytes