Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1c41023c417cc7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 14:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3499508555245ec22c7c7d059ec85a66 SHA-1: ee972a5976378fc24e333a72e59eaa6bdd7bac4c SHA-256: 7c1c41023c417cc7ca568673f47ea03a266fecef7211a6903463d4e8b0d5ce07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to host malicious content or redirect users. While no scripts were extracted, the nature of the URLs and the detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/j46e1ieuafp78g496uht8al04p/nixuwokanateva.pdf In PDF document text
    • http://cozycornerexpress.com/uploads/files/84078103665.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2875dfd0---86846924099.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/96443700372.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fd5d9dd486e50a08ce6e02efb5a6854f/74468340800.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6e938588---piguseruvukelixizegofo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24305488393.pdfIn PDF document text
    • http://ahchala.com/img/file/76540312422.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6199292edc---rejasubilitituwa.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609313d45069e---walexulijovilula.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38003942208.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/27832963460bd33a2058d3.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091003239459---15950652788.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7ccb924be90b6546a6d9b0080e8c7a44/7352983948.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/gojesobujudokuvojiv.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d6a96f04---xipovixipeja.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6f7221119febef1f3f01f07578daf13b/53776250606.pdfIn PDF document text
    • http://placc.info/up_image/mazilekeloduxaxibu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/89638051749.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/fasonukiwijogivepapafi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kolikelijagapujomowebaka.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/498787549ddfa066f63e6173aa9f4d4f/vetin.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873142e0a7---13056213474.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ff1f5ff9a5a6cb5a8b28a5dfb5db3219/nanaz.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/80172332257.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vijosuledimix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=using+pistons+in+minecraftPDF 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_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10784 bytes
SHA-256: b4fe21f93ffde6b298800e0e029cf1acba1e108b7316c1a03918399d015bbe6a
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16536 bytes
SHA-256: 8bdab73f803233c1342a6f84f3c879e41ed93f501cb24b1edfacd6eea3884f88