Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d319a41ca3837fe…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 10:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87bc9508124978bb6e079e93673f7569 SHA-1: 320191d94f2b67db081a90a75207605a693d1f7f SHA-256: 0d319a41ca3837fe335f56ff50933b5b5f84a65603ef6d81985fe85e011bd5f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links align with a tactic to lure users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/edcca7ae672377ce0cd4aaf47be5c78d/80760995560.pdf
    • http://langeline.com/ckeditor/upload/files/vinedikamajunopogil.pdf
    • https://efnnma.org/files/file/tezuxiwosaxozi.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/45963235376.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4d3ebf3eb640e926322d128d2aebed68/12856916363.pdf
    • http://yugang360.com/upload_fck/file/2021-8-13/20210813014825398420.pdf
    • http://agataklimowska.pl/userfiles/file/24827737846.pdf
    • http://analogsys.com/uploaded/file/14561691296090ad0209c62.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/63befc976f6cbe2b6af27e8184aa0a38/ratezew.pdf
    • http://iuf.kr/pds_down/files/zoseginovi.pdf
    • http://fine-cottage.ru/userfiles/file/gukar.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/237pfodajckcojmbrdahh2kqpa/xeluwidofe.pdf
    • http://bud-drog.pl/userfiles/file/51508712199.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2d3f0e52---89120061797.pdf
    • http://clubselectionvoyages.com/images/file/juveravemotevinu.pdf
    • http://edgecs.net/documents/nonoxiboliderikewox.pdf
    • http://www.rannatennis.ee/data/upfiles/files/58735737927.pdf
    • http://rapet.hu/files/kidewisufotesuno.pdf
    • http://westernmaki.com/uploads/files/jiwoj.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cb230763a2d5346f408fffd8abc85489/vudomupagakejepud.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/56c87b7dcd5d91a83da8088a4d483c24/kodetu.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dfba94316c145598288719b6aa4e2e9a/nuvevivemata.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967333e44dc---femiridugikejigi.pdf
    • http://misosmile.com/upload/editor/files/pixefodil.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263609edd7---10904258598.pdf
    • https://actorconseil.com/files/file/98892667506.pdf
    • http://dekoblickfang.de/userfiles/file/56971122041.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=time+series+forecasting+python+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_off0000f22a.bin
e30e0fcac2510e4d8730447f2d6fcff6cac562578bcb3d01b70c8fb3a3037e01
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 11096 bytes
font_01_sfnt_off00010bb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 16792 bytes
font_02_sfnt_off000123c7.bin
49afe47422f100f88ecb8cc8e15fa5f1b72408f042580bef7eba340697295fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 17388 bytes