Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4ea1171f0cafc4…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 02:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba25722326e8d4e619dad98016c99ee1 SHA-1: 101f2c4e9bc5b696d6035602a4680d946228b6bd SHA-256: eb4ea1171f0cafc4d75480d2573fe62125c8b6a2235b24886130ff0b62f1630c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://purmoradiatoriai.lt/images/files/votesetosotofenipeba.pdf
    • http://munsusa.org/userfiles/file/20210902140507.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jb2mlsu42529s7osru12n728o4/34599211779.pdf
    • http://szyqjsj.com/UploadFile/file/20210930225518536.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zexekefuma.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/73900968909.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/30895693784.pdf
    • https://thebookonpersonaltransformation.com/FCKeditor/file/54170169179.pdf
    • http://nj-rshb.com/v15/Upload/file/2021913115097736.pdf
    • https://kermiradiatoriai.lt/images/files/mokuwamujax.pdf
    • https://domilot.com/uploader/files/81942968173.pdf
    • http://behtarinekhodetbash.com/files/files/12384967700.pdf
    • https://unitjaya.com/contents/files/19791276549.pdf
    • http://planet-for-events.de/userfiles/file/kubavuxuwem.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/suvegikosewejavokod.pdf
    • http://strandedtattoo.info/file/5479827124.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3hthoopd64mke9240jdc56iq42/koworisugilonewo.pdf
    • http://guanzhuli.com/userfiles/file/1003862390.pdf
    • http://ptsound.com/plugins/ckfinder/userfiles/files/favagizig.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/61db69abd16a1aadb48ef54e75fcb0af/60497423493.pdf
    • http://pomocnaukowa.net/Upload/file/sulakajoxelubokepunovewu.pdf
    • http://farmaciacogliate.it/userfiles/files/gobetuxizodilew.pdf
    • http://anthonyvienna.com/sites/default/files/file/wimojun.pdf
    • http://metamorfozyayincilik.com/userfiles/file/96808969881.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5597ce8ff---rebaxadu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+premium+youtube+apk
    • 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_off0000b103.bin
b985713f3c73913443394e6447b3f5dcbf47dc78ae61f99b2cc68400e4359603
pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 10516 bytes
font_01_sfnt_off0000c8c1.bin
47290fd01d81d9a6319a1cdd05ea4d6094e316843749cae4567052aa9007fd2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 15068 bytes
font_02_sfnt_off0000eee3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes