Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ec7d62aea72e4…

MALICIOUS

PDF

99.7 KB Created: 2021-06-26 23:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ab72564c7c6590bfcf0f6f812bf62cc SHA-1: da9c18fe2edbed2cad509c7bb9143577dbf9b853 SHA-256: 544ec7d62aea72e468eef1ea973bed9af0e37e423e010839408a18368ea941be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f7520285a1ef43e872f6763a946f1041/lupanabogakijekoliwet.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8d851ab4---87268682929.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3416e9c62d---nijejamawijonewofu.pdf
    • http://unseretochter.ch/images/file/lutafomudutujeven.pdf
    • https://a2designbg.com/userfiles/file/99232972022.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/521a6a8df57b66b8796f94dfb49372ec/80663142629.pdf
    • http://gourmethousemacau.com/UploadFilesfile///93059566276.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6a65ee16b76522bc60f0a9360e91874/6525041383.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kmhmda4bsl9bmu37vun0g7nn01/dilututowapetejeponid.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6966c50b---jararafigagomove.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0c845259---18134773316.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74d7ba626---54399207261.pdf
    • http://alnoorcity.com/userfiles/file/56735873488.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568cd15c1d---dewidelil.pdf
    • http://champaigncursillo.com/userfiles/file/katuferoxelu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4864369ddf---liwijos.pdf
    • http://adamlegal.com/userfiles/file/29628394475.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8eef7290dab5943de8cb6a554037655e/garanasokokamodexino.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nuc6terlf913pkp5dhaovd9gl6/32116601218.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f5a3ec1c---rezimamabazowubekinus.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a81846c325020799e0d50ce7a3084871/ferijaxibijoxuxerogubibat.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fcb0069123f25335d0f338484b046dd/29233147316.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d391c592e1b---nijot.pdf
    • http://nowyhotelik.pl/userfiles/file/bidepuwajovozufe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wheeling+and+dealing+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01c.bin
944d77539e355bdb192e3cacff70c99f9cd5b54b5964399014d72268658d107a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 10204 bytes
font_01_sfnt_off00010679.bin
e673eac19ec57fcad963bb65c8da8b155844a6f09f53f585661e20dcd4959f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 17212 bytes
font_02_sfnt_off0001200a.bin
877303a821f255fd442e6e4345e161aa1da1365f9fc5e74c1b1cb1f509ff6ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 3136 bytes
font_03_sfnt_off00012d0f.bin
141723f1b713bb55e9be0eae9e6d0b2f1222d26250cbe5404c7f789cc41faffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 24108 bytes
font_04_sfnt_off00016837.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16837 16792 bytes

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