Malicious PDF — malware analysis report

Static analysis result for SHA-256 257eb84bb917a005…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 01:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bd873c3cdf48927f595ecf627012a59 SHA-1: 269e24e18c11c0490cea0e13038d7f4cc4aa5805 SHA-256: 257eb84bb917a00526b73b295e4a56d3720f7ccea71b8de24efe360bcb5cf0b4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/901262fa11caf1e3df7437291b14e36b/jojerazumejakeziba.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a556f388309---76767308272.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c0878749de0---77138071014.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fi07p25ndrskt9ur164oc2k9t3/zegor.pdf
    • https://daaeportrett.no/upload/file/2107244976.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16086719dc1923---sorewijid.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55097a398---7521943996.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160805a8a36ae3---63977030550.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qs17vc15cqh4douuresaear4fa/xefegaluduvurudupozusipu.pdf
    • http://www.anjhimayath.com/upload/file/napewezijedu.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/97622242039.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607b912017724---vurakoweloz.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9b2a564d---94072268859.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/j2imm3qsr9eam6664dpgt01fq4/34160069294.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/984803dc10229ce4edcb8bf30d632536/33832358328.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c727ce9639---zanagumugikilunir.pdf
    • http://shinex-auto.com/userfiles/file/68767288942.pdf
    • http://cbgnfinance.com/userfiles/file/tusufag.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/20b9484e8ecd263ae15390e8a1151f11/10221827687.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/lipekogotokarunun.pdf
    • https://glbtrader.com/userfiles/file/raxupuruzixititibofiretav.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8ebcc9c3---bojebixufomefulesi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+philosophy+of+ethics
    • 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_off0000e8e9.bin
d842ad26a004a1d7166b67d55c1c0d44716188b3592f69df3b0edb81483c0830
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16720 bytes
font_01_sfnt_off0001145f.bin
f335094c5f76f5582e0cc033962f8aa90bee3ea62c5d7856e3836164684513d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10480 bytes
font_02_sfnt_off00012c63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 16792 bytes