Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf70b695fa5db01…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 13:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 800ad8c0d121b39a9d729ce49eb135b1 SHA-1: 33ecf0c7932febce6b498071ec1996e4fd673aae SHA-256: cdf70b695fa5db01f1385eb182dcdb97d8612fc234d29ea54349460ebfdfdabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of many external links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://bahispesinde.com/gnc/veri/_files/pumupunowuwinigumapewiwuv.pdf
    • http://dainindo.com/Uploads/userfiles/files/kisagabuxitavivi.pdf
    • http://1am130r6h1n1-k11a7.com/contents/files/lepirowefoxox.pdf
    • http://yidaig.com/uploadfile/file/20211003011022.pdf
    • http://hatdesechia.com/storage/ckfinder/files/nojujirozugo.pdf
    • http://alda.pl/ckfinder/userfiles/files/tawugibixamazisilepoziv.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/50bc19d8618ae91dbc5e2106e090b9e4/63060348176.pdf
    • http://wagnerpc.com/userfiles/files/32545339346.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341eab977b9---ravarevawafugotafipakimid.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5qkilmgja35qrqpe7ke467msj4/91679533881.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/25131538261.pdf
    • https://plasterglasgow.com/fwd_docs/file/45452758710.pdf
    • http://lakesnwoodskerala.com/uploads/file/87859625584.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/dawewoneb.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a953b221a0376e340710983ac3603027/97508968421.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///52207206267.pdf
    • https://adsbudget.net/userfiles/file/54467269688.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2geu128hdmupgmcambavi189a6/lewobigununozedosavu.pdf
    • http://m-s-g.ru/userfiles/files/ziloxelobisigilagusu.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/tuxorexuseserova.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3bca1919a5570806a140380bb44cb404/32187184082.pdf
    • http://letsfinal.com/userfiles/file/getizabotaritebogogi.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614326417fd89---21310534446.pdf
    • http://maudchristan.nl/ckfinder/userfiles/files/mamadawomadefutevoni.pdf
    • http://precisao.net/files/files/noxorejakarovotafule.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/76781435164.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+do+frogs+and+toads+eat
    • 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_off0000b7db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DB 16792 bytes
font_01_sfnt_off0000cff2.bin
5e90ba5d117385ce9e2bb17fdfe44c57d527ca3bbf9dc1257ccbdb8a6e75b423
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 10488 bytes
font_02_sfnt_off0000e78f.bin
9a096d02acb43312cb17c8264b6abd31d1d3b6efd8b2edf9623bd920f95b1974
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 17184 bytes