Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6f57bf61f6af92…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 14:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9ad2b23733ff669658bcd4388d8946 SHA-1: 8dafd8e16b3ff048bb82e4045c6abe4109a6ac3e SHA-256: 0e6f57bf61f6af92e753f5924ff9153aee2784876d5bd9e9b77017c30bac2b3e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories and disposable domains. This structure strongly suggests a link farm designed to phish users or redirect them to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160905794b4526---57591432665.pdf
    • http://sisparts.pl/zdjecia/fck/file/zibibabudavikidoxub.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5280c693ac045b5bf811a45a4491b7a3/47043774940.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7401057746d5b68bd17f84c6fe4ca0b7/jebejuxepimigipomureba.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/dotulutas.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uboqbhilrga907q4t3vq4jpou2/rupulopulekeranofivitoji.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/17da878cf8189f524c0f332c1b2653b8/jakaz.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b67792171---nevefifenafugirit.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7j05ags38isqm8kgc3f5jv4c22/kebewete.pdf
    • http://cnex.cc/images/blog//file/miwefulapapezosuwetubu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e304884b4a---xewuxejujazutenol.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27a816035---vavupezixotexezuxumiwako.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4559747ebc---82876398512.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4d11fbdc62656c913123d70af43adf3f/8868485180.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5ed43beeadc8de76cfdb485428077ef3/zifuvituda.pdf
    • http://atek-ent.com/upload/file/firajimap.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d02c2e26d---natawezefivumonuvurisaduv.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b924420bbb5---zofalipejuwumijewanir.pdf
    • http://jikaramen.com/uploads/files/53220189875.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a6b8d0ec---10240415618.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r1lu42v90um17vnra92nu5eis4/zagikogugexivifovato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fvrcp+for+cats
    • 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_off0000f01e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 16792 bytes
font_01_sfnt_off00010830.bin
5907365bd65bb1c262a6975c6f15b107c0a09d213da7bb3e4025e9dad42e0288
pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 16704 bytes
font_02_sfnt_off000133ba.bin
6e2c3c1e31e38923cd770be8489ab9ea7a4eb1f5cca6ac7ca087c90f0bb482df
pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 10144 bytes