Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc13043afe5240…

MALICIOUS

PDF

77.6 KB Created: 2021-08-22 00:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae15aa91856a47476ebe3167c6e08549 SHA-1: d2d8d02f292633384c797c098a6f18801c777b02 SHA-256: a4dc13043afe5240e38cc7113305d07da32a089a61885895e2db6627dda1e54b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links and the detection names indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/40f605f69abcbef74556763e4d8e18a4/35544074475.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/bopafalegomajulitotuw.pdfIn PDF document text
    • https://citronel.com/userfiles/files/mofetoxexujupiza.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a18063cd42---zimafakamozuxesozime.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/8590651626.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610832cc468f6---84411445380.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fmamriib80slffhte0v0jd8q5a/7981786581.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/84084726081.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/70726505919.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/471a9c62f282e86294bd4761fb82df14/gazogif.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d026835ca9---kikegeribelukisesekikut.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1629100884_1.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c3b4011a---pewuvedifosudev.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g8qss0m325l70ija9vjbs4ivbd/57881411186.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/42212488273.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/56084401810.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c46140acc02---53391411548.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6331198c8ac3e3f4db187ae6d8975bdf/kutop.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/lirapazog.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/jomiwuwole.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ec388g1kkv1951k8l6hd5gshsh/filepoze.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/luzojenevoweserelet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tablero+de+instrumentos+para+nissan+d21PDF 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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 17552 bytes
SHA-256: 204a77fb9a97186381bdd99a10b582cf74b5a7d79cccfff4977269b4e89a9d23
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 10928 bytes
SHA-256: 59e0b088ff717dfd94b23ace60d24054c2c143b192542b51ddbc01c1429e1cd6

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