Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a470cf1ed6f3e8…

MALICIOUS

PDF

74.5 KB Created: 2021-07-19 16:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dc67153c098dc22c6bdd6a92e17831a SHA-1: c3d7426dd79f8c16954d7d8cdd65945df67fc681 SHA-256: 89a470cf1ed6f3e8465f7fd727b70447f5d9fb62c483f8a6cb28f6f081b5472a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. The numerous external URIs and compromised CMS upload links are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b499d77f806---28181062913.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f31a3d4748f---diludodijobixidesegodide.pdf
    • http://steakclubhn.com/campannas/file/79830153746.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/85b9405930a52dc5e9da6389a0bf3021/tajilipirunibelifewerexa.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d9ab76147505d4e98c9e09a2cc1834c8/nixepamusil.pdf
    • http://kelvista.lt/images/files/9902161203.pdf
    • http://gerocuki.hu/user/file/todufevaselagodexe.pdf
    • http://studiotravenzolo.it/userfiles/files/vejilanotilu.pdf
    • https://amitadevnani.com/userfiles/file/ziposugaduzotu.pdf
    • https://gymlesgeants.com/upload/editor/file/vifoduz.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/96594328544.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u092rac6ikvgj8gnmjm6hqdke5/jemabidujepoma.pdf
    • http://kapelski.pl/userfiles/file/59347692298.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/311135db9c3656561524596a9e2306d3/57263440315.pdf
    • http://afro-safari.com/upload/files/gasixutokitaxujeradakew.pdf
    • http://beiwendq.com//data/attachment/file/muvedada.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/a228p44rpcfc8daqqs23al4cs1/sokabiloferijala.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/benevidolabepusasiwokokox.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/48342120903.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b1169c05---zagodezebujo.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ea6f315d23cf701894b5a6f8b812d7cc/tavutuke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gifts+and+gadgets+bessemer+al
    • 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_off0000bf78.bin
9a1d11b5de9afd8b58c23b496531df34f53ed158f4103833aae9f01c8567642b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 10756 bytes
font_01_sfnt_off0000d7f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
font_02_sfnt_off0000f008.bin
8bfe73643760eca57b195ac5f6cc17440e2f7a4f20b3bbaddac75a50d59063b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 17132 bytes