Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a388c27887b74…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 05:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b096bf00878d4b356b18fb81e9adade6 SHA-1: a9d867ced66097014e0d026de75dedb2dc01b7ce SHA-256: f04a388c27887b74a3581fb56a83db5b27f3b619f4e26513646313410460e267
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e35322fea84025eb9380d026c1fe697b/robixokemosenezamigi.pdf In PDF document text
    • http://i-dron.cz/data/file/degurer.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607975194d4b3---gowuxinagafagitez.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/fuvaxe.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/lipij.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gelirogusur.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ruik17be9f1ethaah3uifghik3/zovejovofalipagafowexune.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/32c17842de080b1f7261ca3e7eeadd7a/75915900385.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24c88a803cb1826acbd230865be62f46/talijovimidu.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zoxafijewuwapeligo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe1cdd823---56515333572.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608477df5611f---radogitidewovometox.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc4841454---nolixawinojazorolowomoti.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/musifabejeluwiref.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5jveh8fve2853lr6elsbr8bsv3/sodoredivivu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa875f8bef7---fovajabufesegot.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e43884b61---60492901567.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/39986874986.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/fuzosometuxowigu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3430fa120acfd0f891b4f1364d0187af/28790355594.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6ecdpgtk0kidba7bghlol7teqs/13741640173.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c05170868728b0f14a74f9af238bec3c/sisubezokerukuvokaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apparently+with+no+surprise+themePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/gekifudus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 10800 bytes
SHA-256: d8a83641f975ea53bcb00fabc816c21247f45cda4222604a315b680ef13932ad
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 17516 bytes
SHA-256: 22706dac01be1cce95d2555e496820d76c32eda0897af8799bec56501e4fbce8
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 4380 bytes
SHA-256: ff458cd0b613a872c30553077e7cb8bd24ca86ae15101b0d6cfa52379e10f770
font_03_sfnt_off000141d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1