Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4ec08d2ace86e2…

MALICIOUS

PDF

75.5 KB Created: 2021-06-15 15:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7727ed8057388b67dc7b34158c4e9bb5 SHA-1: 3de13816ff65bfde4fc8b5841eebddd28787a6d6 SHA-256: fe4ec08d2ace86e205cc11c9f528f51b3a6ba3240c4c43907d935a78c4ae9dc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The presence of external URIs and link farm characteristics strongly supports a phishing or distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=carrom+disc+pool+unlimited PDF link annotation
    • http://globalquestconsulting.com/userfiles/files/metiramunawopefegezog.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b64890086---zuluz.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/rovunibaselarix.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcbe7a13e---juzatarebirok.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dd98a96684bcf6b651bf8317c86a1431/57553845264.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/pefop.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14594943899.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e56788dca---58272393552.pdfIn PDF document text
    • https://aspirans.com/files/file/9382716307.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe206b59a2---80483836564.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/860c8d7d5e79718798e368c127128147/38071871879.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/vaporijulazipud.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bdb8e68163f5b837e12ed1fb6e3d3582/1439314613.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d15d30fe1---timoterefapam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 5124 bytes
SHA-256: cc1b3c92b7df60ee836d44ea6d5c88a3bda04186fc0493b44f3af1511c9c8c65
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 10068 bytes
SHA-256: 597c6a77c525b0e505719f7513ba04bb134f737441b45071395aa0dfd389a0fa
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c