Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c2a1cf7a1c6cde…

MALICIOUS

PDF

75.1 KB Created: 2021-07-27 21:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a0e1de58eb43b89a9e81648faf8bb77 SHA-1: 1962aec39f2ae60c8f2665c81bdc1dce82c192a0 SHA-256: c7c2a1cf7a1c6cdeb12201f9bb313af5f1cb6b5d705a4cd9ac0d243a59f289fd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs, many pointing to compromised WordPress sites, strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b24ea5cb18---69490643340.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d4e48cd84405458d95fa8a88eb5a68f9/47986613389.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/vowexuxeponigitejo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kegizakurevu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8i6kn6m1hfgok4cp0gvtmprf27/witexabazu.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/93470465006.pdfIn PDF document text
    • http://honghuibio.com/d/files/8247083632.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b40a307b8---wuvopozudari.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ihcgb2bnbf5c90cg0278d8lir9/giluwenixuvakemufuzijarim.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a78f5ffb794c16acc364c8ebf596cdff/53463788613.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/add4d0upfqo1k2kc25vc445pk8/3096494091.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/90342434ad3c0e6a470da69cc71ae359/47070567850.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a267d7b07---feguzibepokonabikixilibov.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24f62dd1ac---mozaludedawenixozomineg.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eca127cef97---kowewagudijuni.pdfIn PDF document text
    • https://autopratichesas.it/file/kulogifegezaxumu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/zimonefipebami.pdfIn PDF document text
    • http://dsrental.com/userData/board/file/ziridotal.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/28779566576.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda75b19efe---luxasagunegelunupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+phosphorus+p4+and+not+pPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FE 10596 bytes
SHA-256: 890f441bcbcf4398e06eba653ef86b8fb3b62b1101886d3a3b848aa9f34be134
font_01_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 16676 bytes
SHA-256: 923956e959a8a8835eb282cff03fb251f378e5b7efa9204cdd79ac0c9417d94b
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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