Malicious PDF — malware analysis report

Static analysis result for SHA-256 1270f44dbe8a5fd3…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 02:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de842bcbfd42d8bd32bd84725858d01f SHA-1: eaefa91cf26b476089fc56b0665806da3602dd6f SHA-256: 1270f44dbe8a5fd3412af88ef816dc81b82653e9a4cf85c9d047abd38481cab4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution pattern.

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/niuq9md1vvekavv9lfb86h8tf3/jojunuzaketakit.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349631b302---wetokojorusunefo.pdf
    • http://blackshirts1960.com/clients/876325/File/15880178826.pdf
    • http://www.aluvascientific.com/UserFiles/file/96755860812.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52951107a---32361119301.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9504e52a9---95516612623.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dqknip1ikpu694taadhll2do05/bajexunezav.pdf
    • http://okmarin.ru/userfiles/file/93385903947.pdf
    • http://globeksa.com/ckfinder/userfiles/files/ronoliginobozuwewig.pdf
    • http://adveotec.com/img/file/kudozulenokuwigudumefatir.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/989785f8924e1970bc6667a4f3c4ad26/94589665077.pdf
    • http://4grd.com/cmsimages/file/83277821942.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792b6e4eee6---85880563649.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d422e77a---zozagigobazapuxuraf.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b70077e9---50960643662.pdf
    • https://melz-feu.ru/upload/58430536066.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c52f37208a267871643fcd63db4c3937/18736370358.pdf
    • http://msslink.ru/userfiles/files/kafife.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af6484ebf---55928987075.pdf
    • http://armanetti.com/images/tuzegoxijajuzemopifada.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6e48b017a8abafa43e186b93479889c5/numuluxotosanu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b82980e2974---7895196949.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=siege+and+storm+online+book
    • 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_off0000e805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16792 bytes
font_01_sfnt_off0001001c.bin
a7ca9081a880d7abbec5586a4139564bc1e49c890cd3f6ef35273dd56b7f8164
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 10896 bytes
font_02_sfnt_off00011910.bin
0645a77b075b63e16888babfc8afad1e85caf965b12ad75b852e9d3cb6f3ad2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 16972 bytes