Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f78fd425f5b6cee…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 19:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54cc3937d51b08ab0b8ab6a33e9164bf SHA-1: bba1fb4ca607d9f83917b8439cf976814a1c1591 SHA-256: 9f78fd425f5b6cee39c1911facb606cbf5087781c18f84caf15273d1aea7347f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised sites indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hg2id9o83h0q36vd9fifl0ek48/muginomog.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607380f391c76---12888861860.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/75214411345.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccdb94295---91385318645.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c45bd8d0e---fijafesarig.pdf
    • http://sun-tes.ru/files/file/89203186973.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cfc60f30f---43422190662.pdf
    • https://museuminiaturesbesalu.com/files/xeruxiw.pdf
    • https://easybuildapp.com/files/uploaded/files/89102010161.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e29de67608---puwarufad.pdf
    • http://myshopekerala.com/userfiles/file/wivemopefevizidigibek.pdf
    • http://yacpa.org/yacpafiles/file/xotopixaluru.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ae78127c5039ebf82af0c90525fe4157/8553419304.pdf
    • https://pmms-online.com/assets/file/52275429225.pdf
    • https://getadoc.in/ckfinder/userfiles/files/61575309120.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/72e5b28f6e82148444bf4aadbabdcc89/palupijubirisukima.pdf
    • http://aristosaigonhotel.vn/uploads/files/51789231859.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/84762632202.pdf
    • https://angkortaxiservice.com/userfiles/file/97101000889.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/278d7c7990d4bd3446a504d86e6b6040/nixitumakenigilomefe.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8275b03cda---kibimakamufu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c775007285---81784001444.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/kozonapepivivasamuzekos.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d8f336683a83349aeb7c581c78e2f3a/tufoxitakuronafenorulaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hunger+games+streaming+english
    • 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_off0000f326.bin
352b2941233323a58999044f4549ac9a35af8b9b902c0baf327980d408a4759b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10524 bytes
font_01_sfnt_off00010ad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
font_02_sfnt_off000122e5.bin
c5657c668543cc24fc5bfb31556a9240379dc51ed6a3d87fea8e08547ffe6ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 17436 bytes