Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffbb48aac51f169…

MALICIOUS

PDF

77.1 KB Created: 2021-08-20 14:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1389c1bbd35d3176c7f675b02106018a SHA-1: 78c23e67d5df25298d830beb85c421b2436f8588 SHA-256: 2ffbb48aac51f169a623d8eccc0b36eba1d09aabe7fd33b2608f685b8f57f0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. 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 URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=expert+python+programming+pdf+github PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9d9dbede4ea8e5be106ad2ab8123b775/zisanexu.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/lepavegakuxagevakovu.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830abedf582---83809406778.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c290f8627c---lubovep.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/nelatijuzusakiwotit.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713f0761b03---57435153120.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/56220754510.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/86136978026.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b4549eee---tikirijuxunuferewezebize.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/79959220697.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081eba6235fb---mezosibidobavexiwi.pdfIn PDF document text
    • http://a-pluset.com/userfiles/33961470031.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4b934183---fixunasoweni.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/74739344265.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8m4dnhmp86iji7kmsg1a8antfr/xedifosupulen.pdfIn PDF document text
    • http://topp.pl/_topp/file/70075971255.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/melitomijosewasazibota.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9e42f0bc---pamilovetinajexerololuj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kilevuruxomepeveg.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/19204185864.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c612596f---rofezuguk.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ecb216c64a---33087257769.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/82510107344.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c396f92ca52---xotegaloxepezujatuva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 16620 bytes
SHA-256: 430d971a14a4ce33d9c1f155f15fae8b7f405adf1e08d661916796416c5ff4d6
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 11172 bytes
SHA-256: 6d18b6773eb439adeb2f4354ceef764cfeaa5b7a77af1b9a7e32f1afb3cf7a0e
font_02_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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