Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce9e7843f0eb737…

MALICIOUS

PDF

71.2 KB Created: 2021-09-02 15:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cce85fe76d0b4ba1566644b5c073d5d4 SHA-1: 6af1ae477826d9035b3f88d63aaa6e83f1f9aabb SHA-256: bce9e7843f0eb737a1ca8bc0d1c3da4b8a6f28108f4938e8c20bb94533faa746
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely functioning as a link farm. It contains numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The primary goal seems to be directing users to external sites, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://pioneerlift.com/upfiles/editor/files/60413722600.pdf
    • http://vsrru.ru/userfiles/file/xizuranobemalugalamesuv.pdf
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/13072014871.pdf
    • http://satyavnetworks.com/fck_upload_images/file/22490080011.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/34bdf83ca1c8d7a4c12b4b8fbfd8fbec/dapegojamov.pdf
    • https://absoluteanytime.com/media_file/files/files/56485267732.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/46458714146.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/ralimok.pdf
    • http://jaht.com/userfiles/file/54482554040.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/98f1c1a09ebab5bea057bacc4c3c1a0c/suwux.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4d48af7a70cf4cc8ae49fa192b730010/50287033298.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612c047d2a7de---31206549292.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/66582022978.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t82k5h784b14p8k6vg3flo5qlv/lidurolu.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4f8c7987381f9cf74a5282fc041b9842/mizosogadufudekemazoge.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115a18221ff---66938243655.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/96984024679.pdf
    • http://studiovalentini.eu/userfiles/files/memezej.pdf
    • http://gpshardorawal.com/hemkunt/userfiles/file/kekobowapiraredatisawu.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e23cc13b11aec2472c18ba59556dfd88/11686789221.pdf
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/wixibukopenix.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3a757562f422515ace8130e3b1dffce2/1213685286.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/436a8fb6753e2770c43fa4ccb770f0f8/4962591007.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nortel+polycom+soundstation+2+manual
    • 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_off0000b49f.bin
b040de78f2d22f2b023b6a9e0ccd667464159d4e8e718b67b8b8cf27ec5d71bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 15896 bytes
font_01_sfnt_off0000ddbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 16792 bytes
font_02_sfnt_off0000f5d4.bin
719a6b424500e666ce94dd6c763dc84e7c14cb5c3f460946424fe2a59b2a2c02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 10984 bytes