Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce7ae35b2b0fd15…

MALICIOUS

PDF

88.5 KB Created: 2021-07-18 12:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf8f094c55936b19a971b1140292c154 SHA-1: d8d417d019252bb8fa52106f6a9e33935107ab81 SHA-256: 1ce7ae35b2b0fd15f4ed9eafc54c08595b6a99d3e730a22b086ab43ccc4330e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised CMS uploads, suggesting it's used to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, as they likely host phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04bfb48787---40410344438.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b95b9640---gubofokozigosiwedipek.pdf
    • https://editionsitaliques.com/userfiles/file/54628421090.pdf
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdf
    • http://aostavet.it/userfiles/files/76561227137.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/350d20083100fa2d2c02c701647d1df3/wanodirazuvi.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7eb4271---vupakopirevuxepujotapew.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6e73d7704320410ba7762205013f8627/bikeduzufofumi.pdf
    • https://digireg.it/upload/84129642560.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ca1fcf7ac3a422a769d54f6b463085e6/19458180767.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/343st5uf4lm1ltrcabu2tm8cpv/metubakidupatet.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0a2726e8f88759133d17a0457e651cef/moridan.pdf
    • https://locoffice.ru/userfiles/file/ralijifejekijububolukokoj.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210627160908_Z2VidXJvam9yb3BvYmVwb3dldGl4YQ==.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/puupo4lmj7a595fe308cms1jhc/9453096517.pdf
    • http://agcslohian.com/userfiles/file/juwipesogomifigozubaz.pdf
    • http://brmhn.com/userfiles/file/20210529142704_8dk0vz.pdf
    • http://getem.eu/files/file/limetel.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/941f6438ehbcnf3ltk0viujljh/48509992204.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ekgicjvcpvrfhca7jccbtk54bo/fuketalujaji.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/62c91de0f61bc5049c1cb54275f4f7cb/wigafefanusopasaxemubabu.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608156db9dc8f---fufererufosefoleniw.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508204955108.pdf
    • http://jkbprivateiti.com/userfiles/file/69446966553.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/5502e2a8ed7d87637084517751d9a15f/dovawoxawiwagalif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+ideological+origins+of+the+american+revolution+summary
    • 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_off0000f450.bin
c44a2ac3db1389cc6195fd47b69d79d641a175c85cb44b894bf6b04d3593f7c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 17044 bytes
font_01_sfnt_off00012083.bin
23108e11ec5e09fe1a88bd9b7960c111ff1188d1680933ea21f2b049e3ba43ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 11164 bytes
font_02_sfnt_off00013a45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 16792 bytes