Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f07d9f871d3dfe…

MALICIOUS

PDF

92.1 KB Created: 2021-07-13 14:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 372b97d6a489cf6b44950b588704dcd3 SHA-1: f4121a74929f7639cba26e105972e0b3c7214eee SHA-256: f9f07d9f871d3dfe3dbf8f31b55c4882b9befc8e8c7344cec0dbe2cf0d8c3a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://gamasteel.net/userfiles/file/danunibimetonolisemes.pdf
    • http://russkiivopros.com/images/FCKeditor/file/99594787970.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q2jqpmisfd067cknu5ac97omdo/roburefu.pdf
    • https://nadinerogger.ch/userfiles/files/wadaselu.pdf
    • https://bitree.ru/ckfinder/userfiles/files/41443171625.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0bdc75a1a---natebesop.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/1bf0008b78c9a92113e9080a96679534/depimejowokugefixa.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/46986988475.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/71692590136.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/01752092256e67bb6812d4cd6c9420d9/rageg.pdf
    • http://tele-fonika.pl/upload/file/31036122009.pdf
    • http://www.findvoters.com/userfiles/file/30631439360.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ef8b8b0cd---52637221989.pdf
    • https://scapetime.net/images/website/user/files/sotoxikorumubexugeguso.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7a3980696131372d44cdb5a2e5c950ee/7529322480.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/25bf75b9d5f56f8d7462b0825507161c/57238167157.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5753127c---wawawetiluzawanab.pdf
    • http://asbazainville.org/userfiles/file/menavopaxogeb.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f44b59cbe3---28604968631.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d0d9eb958d7fa3299f3b4659409f6c5c/tuxipofiwojetame.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e6da437d1044805e6d479aa32b70b/98804305327.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dgvkh7ivfgpj7ojdm08ukokne3/jixofeve.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/7be5efb9d84e9731d21a5cc02d98193f/90214681347.pdf
    • http://loaamtran.vn/files/usersfiles/files/fobofumijugumosunijodunel.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/37940211033.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chiquis+y+los+angeles+azules
    • 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_off0001062e.bin
b1d5759bc4f6f0fe972efb68cdbe7988c0765bdf089b2110b5892e100fba5592
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10640 bytes
font_01_sfnt_off00011e36.bin
6554d23d28c88800a3151318bb722e905ab14ac58b36b0bb5d1de786656a2c08
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 17260 bytes
font_02_sfnt_off00014b33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B33 16792 bytes