Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30585f78f493a13…

MALICIOUS

PDF

91.7 KB Created: 2021-07-25 20:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c0b8de7fc9419202fe5240b456dc5527 SHA-1: 62d61d48ff92be1e84370045c6538df8c6d04950 SHA-256: d30585f78f493a13eb29535e3a93920e36e037e84abeab3c7bb29bc660bf29c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the file being part of a link farm hosted on compromised WordPress sites, designed to distribute further malicious content. The embedded URLs likely lead to second-stage payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7165855b51---zakugubajozakigup.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/5987a3cedf653eb3475406593c8ac9b8/78976253611.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2b8e3ce1a8ef7bb8582070d510252d0e/jivukasowema.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/66834638821.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/38209750665.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b91914d70---5589800654.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qkhom7vlfumr3ir967ifkclfn0/81144578506.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6ef956cc8---jibof.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/filigozonibijawisudefip.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/55178651014.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ff7a003a54740b4cf950b5ee54b945a6/71252658041.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b309c0116cb---19394519225.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/86155720005.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/68oobr8tk3boub6csup87geog8/tepakesoreke.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/gebeb.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i8o4n75r8klpmu61keuqukpl27/levobabotezadim.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/88078882498.pdfIn PDF document text
    • http://airfa.it/userfiles/file/69632475332.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f730281c37fd6027411918e2be176fb1/jotidoli.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f483153b---jawawaruzopozax.pdfIn PDF document text
    • http://ruihuitax.com/files/file/devefagiretivaxikasup.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/muxudoli.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mgh9fga53v21a95lfns27ld0ft/wuxotivozivej.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210723210958.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/39959308603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=teaching+strategies+for+adults+with+dyslexia+pdfPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16580 bytes
SHA-256: ed98c036dd40708811172f88909a6fc321470a7cf04c12600bda4b42e7872608
font_01_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 11264 bytes
SHA-256: 5cb3ae2d6564c6e0078bb1d0ddcf8375dc84aebbda27a5d0ffb4195cf0c90769

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