Malicious PDF — malware analysis report

Static analysis result for SHA-256 875c3bc437c59fb3…

MALICIOUS

PDF

97.2 KB Created: 2021-07-05 04:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8876d413d9c18f78a607a975cc921ca1 SHA-1: b9ba7afb1045849ab00849f0e1c9cfa924926e88 SHA-256: 875c3bc437c59fb3909beafadc2af845af5cf5e30887f66d0878b356b9583193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://wastran.ru/uplcv?utm_term=maldives+places+to+stay
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cc905cb12afa261a7f5d0e56fc2f8a7/85263737883.pdf
    • https://an-professional.ru/img/files/file/tibevusoko.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eib0krjvdl90nhs06gril1og4c/89046787580.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ca98608d1c5c6bb5095c146b271e24c8/59413663271.pdf
    • http://aceonlinementors.com/userfiles/file/602629102.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/879343dcffee1f4b8004ab3bd45ed610/ponewimewifebidofezila.pdf
    • http://sinproval.it/userfiles/files/1591132704.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/kiwejusu.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/eb26da0d9792125651e948ad779ee692/pibax.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/madorebedetapiziw.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/tedaviremajogukujina.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75614635b5c223a6be51e2ac3c85cadb/24745920560.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e881f244d---48088875094.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083030a28135---42103248327.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lujlnghoe4udh8db8tq9qa6979/mojawosiluxaruvoj.pdf
    • http://naplesredeals.com/userfiles/files/gosatobewuzavarudonuvu.pdf
    • http://www.deep2001.com/images/library/File/89161310945.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f0378c7ca5883d9ce856add3a408dbe/wovunezen.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8afa4c2a2---54879654822.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850b5e56b6---zerixanupelilu.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xilipazibafugosanenot.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baca5d8e541---pakigegevulubenevug.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076999763c92---kesupodunodevedujejad.pdf
    • http://gleneaglehoa.org/images/file/53193140728.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n807aqlrkrbm6ikk0jho60c777/962334429.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a99.bin
8b5222541761fff229e1141b98593f1b31bee830928622c543b02c427293b299
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 10476 bytes
font_01_sfnt_off00013290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 16792 bytes
font_02_sfnt_off00014aa2.bin
9183f470efc29961666c6cfa2b9357ec493f6d094c1a30b431a1d197db733b18
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA2 17488 bytes