Malicious PDF — malware analysis report

Static analysis result for SHA-256 290e21d2a0480565…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 18:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1842f106a243cd699f5b9147591f5301 SHA-1: 034718af1edd6823f6cf0690c9c75193262fd680 SHA-256: 290e21d2a048056545af6ec56018edfe0c95c62d28bf67896f28812979f94d85
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://eastcity.hu/ufiles/file/jagobirata.pdf
    • https://dalton-english.com/userfiles/file/83790494750.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/toparelifowaram.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949224133ef---29451089941.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27404cbcf1---tunepugozizosawepoxer.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/42897720033.pdf
    • http://abroadster.com/files/zojifejub.pdf
    • http://renovfab-menuiserie.com/userfiles/file/36330651589.pdf
    • http://kapli74.ru/upload_picture/godoxufijawepitizimedino.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a183b4a5e95---videxewades.pdf
    • https://ancoraeducacion.com/images/22001977714.pdf
    • http://sinorarechem.com/upload/files/86364651513.pdf
    • https://0955205219.jwa.tw/userfiles/files/38677212447.pdf
    • http://mobilesamara.com/img/files/file/8405913936.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e130df86---50554862793.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lovixinemidimuvetan.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/xujelibigorilevu.pdf
    • http://rubensova16.cz/files/file/38253588908.pdf
    • https://securitegenerale.tn/userfiles/file/51113875892.pdf
    • https://sofahatinh.com/upload/files/japabusotuwibezaluxi.pdf
    • http://mobilesamara.com/img/files/file/mububosulaziwidawab.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/55532057533.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07cef5a865---58193778939.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=serotonina+ksi%C4%85%C5%BCka+pdf
    • 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_off0000e04e.bin
a779e8528dac0df3c0a76ff61185722b5201a88698d3298994138d08bbd915e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 10956 bytes
font_01_sfnt_off0000f97e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 16792 bytes
font_02_sfnt_off00011190.bin
0c9824881c4885ace98e83dcc7a85869bda75eda7f815ff6c50a713280a20918
pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 17996 bytes