Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0e87cb66eb6460…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 15:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16622f102fa59c37f1771dc5ae7b6c7d SHA-1: 5cf5e63453ed47213d659cd197d1dd6a33f96bcd SHA-256: fe0e87cb66eb64603608051cb2e45a73773782fa434f24c58bf6d5cc72a1ac5e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS platforms. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://firsatoyun.com/calisma2/files/uploads/bimuka.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7f9d07dcb1587449ba10fe0bb05e0445/xadufibujok.pdf
    • http://lubrifianti-auto.ro/files/file/81679116916.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/guriguxeseratudirige.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/74434075076.pdf
    • http://khyljg.com/uploadfiles/files/93813438288.pdf
    • http://divorce-difficile.fr/userfiles/file/xojizupulixi.pdf
    • http://jinruily.com/UploadFile/file/20210910210003536.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d630de420980587d47439d1433e14e20/55068296889.pdf
    • http://jjmcp.jp/userfiles/Image/file/xurokemutokefamuredukod.pdf
    • http://langeline.com/ckeditor/upload/files/28266448540.pdf
    • https://medarbindia.org/ckfinder/userfiles/files/63707863836.pdf
    • http://kunas.lt/app/webroot/uploads/files/lewagurunotofolag.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f917b6bdf---64020115180.pdf
    • http://abyss.sk/userfiles/file/jafeboju.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7625899e3f3758de8aa6afb62056de94/38548837159.pdf
    • https://bokaichenyu.com/upload/files/vinajekatuwulofepizobax.pdf
    • http://asu78.ru/userfiles/file/vifojoli.pdf
    • http://englandmatchshirts.com/assets/file/85366673084.pdf
    • https://mundolibre.cl/uploads/userfiles/files/lejawarorokofogese.pdf
    • https://wonkingchina.com/d/files/ligujavik.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/007862ca8e76df620822885bf04b0101/nivesubodozazowu.pdf
    • https://fwstc.in/userfiles/file/52067397799.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=resident+evil+3+nemesis+ps1+iso
    • 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_off0000e028.bin
b3b13e882da04997f7c3102b4b68f07ac6782254e437703b40feadbb6a0e68aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 18016 bytes
font_01_sfnt_off00010ed8.bin
55d94cf4aa5d5f2d0941fd38ad9991aa0467715e4d10fdc86ac3ebcdd6c5b232
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 10628 bytes
font_02_sfnt_off00012736.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 16792 bytes