Malicious PDF — malware analysis report

Static analysis result for SHA-256 442287fcfde17a6c…

MALICIOUS

PDF

100.0 KB Created: 2021-07-06 04:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c95f0cb46f305d8d618e7f37c2cf599f SHA-1: 8cfb59b2c2ec4d7472965b50e361e0cb4e6c26e0 SHA-256: 442287fcfde17a6c1d001563736dab78f4770f5b29332e86df988cacb61e98d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/07911ef3a3b782171ac145f76de11e50/gamilegizuwupaweridiro.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb27c791e---57754921734.pdf
    • http://poorclarescork.ie/images/57363423013.pdf
    • https://annjulieskarpmo.com/userfiles/file/69585531371.pdf
    • http://mextro.de/upload/files/sajoxaso.pdf
    • http://computerdoki.hu/user/file/60806521820.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/35eh327jetlfruqf1634rrqrnp/nekefazetaz.pdf
    • http://auto-spec.ca/fck/file/13909822544.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/477e4504bcaf299b40afc1fd915f2dc7/rutalizewega.pdf
    • http://kaupa.cz/userfiles/file/61599636106.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/18542538508.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16070d493babcd---nolunemegimozaxomop.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0983cab58ebfe6f3ac890623cd16dea1/burimuwawekeg.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4f58596e7---10853950996.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/togulebana.pdf
    • http://baugeraeteverleih.de/benutzerdateien/9096254116.pdf
    • http://delannahotel.com/user_img/file/83293823374.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6408ea428644087e1ac43f12d612c30a/68813199030.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aebea0d4e20---88909231942.pdf
    • http://aircond.md/upload_fck/file/vijivovetez.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e8912a75---62615395142.pdf
    • http://dok-vo.ru/userfiles/file/81237134103.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=partial+and+ordinary+differential+equations
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c2.bin
c8220e318759d904686e2c1bfc3ae3f3a1f5fc755ea37c503ee75ca8e8746d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 16148 bytes
font_01_sfnt_off00011c3b.bin
4bd2d5cfeba95e74094c67cf0aa059a9ad0c84d8779c6f8b9e7c13b9661fa4cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 10708 bytes
font_02_sfnt_off000134bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 16792 bytes
font_03_sfnt_off00014cce.bin
64a68cce1b4e4bd5c42a671dc875b12eb9e8901e256c3dcfb97e9b61198d876e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCE 20300 bytes