Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6a847d07b4703c…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 04:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b5c0235002acbc498aa14e3c62d2353 SHA-1: 9a8e60efbb4f99722a58e12253e1b8533a0d95eb SHA-256: 8a6a847d07b4703cb272732d545ecedb8aba8bd0341780cc5d81ab5fc33eaeb8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The document body is unreadable, but the heuristics indicate a pattern of hosting malicious content on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://remont-elektro.eu/archiv/file/38471374579.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc39db282a---dutodad.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731076b8a12---rigodoboz.pdf
    • http://escuelasfutbol8.com/docs/files/navizukazufalelu.pdf
    • http://good163.cn/Uploadfiles/files/rataketizetogadomutu.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6a53d30f26b16e657c89f56aaad546d/lubivibokunox.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079016c42bd5---24914416186.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9dc5af192613a669d7dd1eb86bac2aba/46597516474.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9fb0f0acd4e5c43d0af319c7a0dbf743/jivuvufujul.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd20732a0f---puxezurefadezawevofebo.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070953da9960---72968414224.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d22549316---mixuki.pdf
    • https://dodatnagarancija.com/userfiles/file/dajoxupizafuzi.pdf
    • https://studiorampinelli.com/file/zedupavopewaw.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da2d253a9e2---rumisome.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b16440827e6---21368383403.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/sevaninanekuxereniwutije.pdf
    • http://sity-luxe.ru/userfiles/file/dipemodesosifemem.pdf
    • http://colescastle.com/clients/875019/File/bumepota.pdf
    • http://cn-junsheng.com/upload/file///20216108795164.pdf
    • https://mgc.to/sites//web/upload/files/mufadebidifabelusibog.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/38721e78328bd2561bc2d72246fac0d2/segakidip.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/gijavekelil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+past+tense+of+help
    • 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_off0000f2b6.bin
bf81891406eaaa1d5a3627e5db8d0a4c51cbc4290a860298d43f0540c740679a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10348 bytes
font_01_sfnt_off00010a08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 16792 bytes
font_02_sfnt_off0001221a.bin
f510f944df9ae38fd02fcbeebbfa0571a0dfa0fabb9e07b2cc6e3e9b5ff6510a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 17404 bytes