Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d94d7620d0f3ac…

MALICIOUS

PDF

102.7 KB Created: 2021-06-30 18:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7c20806cea577920c4ae5dbd8c2cf5d SHA-1: 95a232bd5ab91d05f985d4f62b216a287df48b40 SHA-256: 56d94d7620d0f3ac9222ad813f5ae054ac8eb223ae6d858f5389f5d501b87c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083881725859---widekoxujiribonerodegokej.pdf
    • https://stef-nancy.fr/upload/document/tobigi.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c03cvg7hm3q37993epppbf89pf/rusipuk.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b673961389---baxabu.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/us832sbmnf4o8m3eekvji3e99o/16281898734.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/543669ebe3cce62610822107b1202d58/jomuwusazeboxujotisol.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/265d3f6eb034f5280835e164fade10e4/jerofijibababoparilifefe.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773fb4b6b19---xoferisuki.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f198ca2b7---futonewa.pdf
    • http://aweibel.com/Photo/file/debokuvolesur.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/702fbb3070d6b72ae3b1bdcdf2860614/nikukowutogesanitelewajaf.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30e111d23---dakotefasafoxotuwemomuj.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9319de6171b99b1dac9284a234359bfc/tawotobesuzuwosoxe.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/oqfumtp6hi2ln595q0d091clf8/xofexuw.pdf
    • http://www.urbanwaterways.info/files/13446321519.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/42bea8ddeabd16f7cee52c9d15ce9a7e/19749285881.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c652e434463---51583152000.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/775fc27ba652f92a92d3afc7754892da/mojuti.pdf
    • http://www.tobywells.org/media/fckdir/file/riputodewakozor.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7d8f905---dikar.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4a74f145cb3cc4945379c62b36f6c6a6/zaxabazajetum.pdf
    • http://agiusfuneraldirectors.com/files/file/dalepekukavaxap.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/08db07dcf2a84cfe65ffd97f19fe8d97/laxuru.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/au02te67tvhfkcqm1rne3es7v1/weguro.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8156d893c8760f02dcdcbf788ec03c49/guzagokowuresamuk.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb298d6a2---14135801127.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ford+fiesta+automatic+vs+manual
    • 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_off00012b87.bin
a602d794d69b98bd7cfaf11e64c33e864b4897146dd947c64babfe996d5c9366
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 10780 bytes
font_01_sfnt_off0001445a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1445A 16792 bytes
font_02_sfnt_off00015c6c.bin
850231b897f19cffec57b7b1ad15c249a361f7a22d327e21cbbd20d4a46fe0d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6C 18120 bytes