Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d1721e042b4ce2…

MALICIOUS

PDF

92.3 KB Created: 2021-06-25 18:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b1b028cd1486625f2d66cfedf6b7f36 SHA-1: 8ba5b48f862ffc15ef96ebd5e4492b71a0f83613 SHA-256: 39d1721e042b4ce23e624c2c78e66625c1e93adac20620dd62966b4adf70271c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across numerous domains, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be redirecting users to external, potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4c05a865---66317069731.pdf
    • http://kiuanai.com/userfiles/file/18399639255.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e1d8f783---guzenajezekuzere.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1b4609ab---17116645801.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712e146f7e---talopen.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/j5ivbv57b1sn3k87883hhfd4cb/57587614779.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d0978ad0---bedifap.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815719aa3d8---xefowalofasaxazi.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tbtqb5f2ht0n2rtocoslsvcf45/9995439372.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bce94a3f3---vujinagopofufe.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r66jop8plj90jfg0hck3eme7s5/7199890353.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i17h5rafvej548oonu1hhtcc65/42404532818.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/716ifaa9d82ptok5l68b8nn43k/41281091531.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609550b928186---25370470180.pdf
    • https://ayurvedaemart.com/uploads/file/sonaxofadowesazaweruki.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec07fafd5f---mewiropukigeno.pdf
    • http://kopdesign.nl/userfiles/file/15582867428.pdf
    • https://bursac.net/userfiles/file/46776326522.pdf
    • http://aarogyamedico.com/userfiles/file/kijeporajakixewodawofota.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f297d0808---45024746530.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/rutinokuparebeba.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a4561566fdbd7614f300f98541ba011d/falejogupifujujofovadud.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4579a07ee7---11589226693.pdf
    • http://megat.pl/uploaded/fck_files/file/satuvidekomejurexuxe.pdf
    • http://asbufestival.com/uploads/FCK_files/file/56406315471.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=7th+grade+algebra+problems+and+answers
    • 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_off00010326.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16792 bytes
font_01_sfnt_off00011b3d.bin
68cfa983c81a1e4b723c0253490d459b853101ebba02e3276088d38938eae554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10928 bytes
font_02_sfnt_off00013407.bin
7463830462323b1492239c8a6c382c97bc613557cf5c247f11df15f7ef31f81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 18024 bytes

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