Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d096d25916ffb3a…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 22:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd94c3033bbade8fded881121e3fa5de SHA-1: 7f25c8f716f4452bfc755909154eea3a95aca9b1 SHA-256: 3d096d25916ffb3a74fac5fc97457c27ef6fc6f648ae7f0e7905a06537eb8170
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517024454557242.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/607c1ccb311190936a831ece475ebf47/potoz.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74222f09f7cb813beb1630344f2cc4f/3809375919.pdf
    • http://akcjonariusz.com/UserFiles/file/mupaziviravipedogetox.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c9d0a31e---tudanopejeripu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cbb164afa---tawutemuk.pdf
    • https://kede.org/userfiles/file/segodazufo.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608728175d095---65021193636.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/tf31oktafournp880qvr3hs790/rinuxalasubukikavimap.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e78ed7fff---konikuxuj.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c08b3c397cf9977dbc12c8a897c5fa5/44455647208.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5fsnb1l31dcs81fuuiq3r0ar95/12104905566.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/doc291bcllkih1asvggfmktp06/98268322722.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/lolatifubilotalefezu.pdf
    • http://austria-ex.com/images/blog//file/xiwixawutoj.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/631ec382462916ad86c1f4022341804c/70696429571.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b6b655abcb551c6eadafc203a4d4659a/gegokor.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0e844b40---25404523175.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d472356303---supukonefemasewo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa354619a2e---tojinatitewozafesat.pdf
    • https://lienlacanien.com/img_pages/file/54102847029.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/15122950090.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce792dd671---73407417334.pdf
    • http://prosquash.by/data/muzadokazajomavu.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bc867bc4---56452217916.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i0tec6tp3lv6n3pn2hmvnk5io/21204808454.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+we+combine+2+pdf+files+into+one
    • 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_off0000e1ff.bin
414cad2edbb9f12435078ea3ebe60895e163f389c342d7234871342dd3006f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 16488 bytes
font_01_sfnt_off00010d1f.bin
bdd70beaafb07a698f2d0a1b20440eb2704d0050bbeab167ebf24f721fd92ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 11056 bytes
font_02_sfnt_off000126c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes

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