Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf0a601b9a74aff…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 13:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9a7635987ed05d498aaf4773052ac58 SHA-1: f11098dcb27920ad22788d751efbed11aee92073 SHA-256: fdf0a601b9a74aff93e61ee1d6e20a2c14dc8ee6b62476d1420acbb2ac2696e4
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d2ce55c0b1071c92a4a6ef77d561cb93/mozubepirejupetobitejewu.pdf In PDF document text
    • http://hitelesen.com/userfiles/file/nasuxoriri.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/kekob.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/77880734170.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/43996005206.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dim7o7nfql6voi5umlk7ashgd3/dewizikunodujesal.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/46408047622.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/lilobogo.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/10781457768.pdfIn PDF document text
    • http://atomleasing.ru/media/File/60617447035.pdfIn PDF document text
    • https://webhosting4.net/media/file/43961896147.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/bafajuwizoxekiduwomidaj.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ccbd90d7---34452125608.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad27529ac7---sasulal.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/86651291131.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/33236681197.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/vusimazide.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/kigaxedodelusisejap.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/11854726619.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/4445242987.pdfIn PDF document text
    • https://kaparatt.com/images/File/95281794176.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/jakopatelebu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/38122106908.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8vtsmgl28nd55irit1g0hdfubr/wewebozevujolakukoki.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/61982118255.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69563476041.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea9583ecd---69622249652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=star+wars+jedi+power+battles+ps1+romPDF link annotation
    • 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_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 20332 bytes
SHA-256: 8e1ce8508a8cb1e974b2b7f3ce6f919c91380f162e73528fd8e1d306322ccd59
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 10932 bytes
SHA-256: ca3fb21095d74f28654510b0cb2dbaf1453c2f5cf0b136c38cca9a23d1eb027e