Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf92561b937c5d8…

MALICIOUS

PDF

94.1 KB Created: 2021-07-03 17:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3783d614ac53dcfc511422cb73a97a32 SHA-1: f9ec628fa61786fa63b6c2e2fe0fe966ff6de3e9 SHA-256: caf92561b937c5d89932b88e1d7c9b001f35fcb8ed68079a364e433e6fc00d40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7451c707---99233623070.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955644fefd---12564034518.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/mosijinati.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0bc408f1c---46278373034.pdf
    • https://mecaniquekd.ca/upload/file/68425805071.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aceed8328e0---kusomi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ca3a8e625ddbccf60a8213a45ba12227/26184273175.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccf15de9b---12892682467.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/25567415771.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/31jlpi0ed1lv6urkod19141mb0/73137209406.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863165285b4---59171068230.pdf
    • https://ancoraeducacion.com/images/fupekolomabukivukezosu.pdf
    • http://mientaytourist.com/uploads/files/7033621609.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/57838826211.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtkfsas7p0c0q7e512k9rgu2sv/pusatulurit.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69e380330---nivakavawipevuge.pdf
    • https://egf.tw/test2/images/file/62716044146.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b773c3c5951---lipafapuwes.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/624a713af35eee12cb428ea48f8aa881/fibudezufudux.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dafb31123d6dd945c1865cd70da3364f/tarokixosamituk.pdf
    • https://alrashed-alsaleh.com/userfiles/files/1965843508.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae2c9bc3---42944203547.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2mt9ulu0otuj9222sf1hs6as63/63711581822.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d5e6ccd1b4368e58393c67db3ae921b4/60918936942.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2f31585ec92826b29eeb86f52b951e44/80294895002.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/deeug7bdbk9cpgndv9k0r327gu/99812965725.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=breezy+adventure+time+song
    • 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_off00010d0b.bin
64bafd34f9ec7c59b665492941991b42303ad13b03346ea08471b75ebdc53ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 17076 bytes
font_01_sfnt_off00013987.bin
4de41a524a5be183aea6a863b8d2a4ed117e2651f213676d0abf4f57fb666dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 10940 bytes
font_02_sfnt_off000152c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 16792 bytes