Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fcd3e210ad3402…

MALICIOUS

PDF

90.2 KB Created: 2021-06-30 21:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cbc96f382869ecc077ef3e8a8a5958d3 SHA-1: c3bbb84d60be440cbd62e03a22354c348f57a29c SHA-256: c1fcd3e210ad340218d8b7338980ed99153491246c1e901f76b77c4a942ebd8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of multiple external URIs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=how+to+answer+a+who+am+i+question PDF link annotation
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/fuwisijavege.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c285a7a84c1---37214265621.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607627ee74406---92648459092.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/52257772467.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61f9e77f5---defelesuwojitoxiduluwidi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92c1a2baf9ea5812e73dc9f8567a79c7/raxawovose.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2856135546---bitomuta.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2494722e4da7d16d70fc381ab2114f80/fasakubalo.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/gujema.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9c229cfb---romakezinorotog.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/24842856227.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/fofitunumazox.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/58f07f5e62b362fee7db16b93d40c09c/76817552661.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a98fae976c---47829546032.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12a95ea81---gagonomerutiwaxekak.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gasatewanos.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/dofetaxod.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2a3bf7a015e5ed967775dc96be3a71a7/14442608782.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/nojobikafumurisib.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607556dabe105---perawilalumetupozon.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/39a0da53bb9a232cff0c67daddcd5fc5/43930523143.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/16255252460.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4386ca9bb48c233429380fd9a67e76f8/pulovaxedeket.pdfIn PDF document text
    • http://easykart.store/userfiles/file/23618512613.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcd75a72d---giledobuvobefijaxejalani.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc88d1a09---teburujobi.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_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 17500 bytes
SHA-256: f0ae5a96e7e8c2cc97749d14a5f677a8e7abf2e992e1fa2b0118f83283ae04fe
font_01_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14370 10652 bytes
SHA-256: e3bfdeb5382158d656714f880acb06af0600630d459cb77f33fe3f5b05b66ec7

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