Malicious PDF — malware analysis report

Static analysis result for SHA-256 d665d806240da830…

MALICIOUS

PDF

106.7 KB Created: 2021-07-05 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e468fff7366fd967540005f652857ce SHA-1: 253a20575ffe28100ee2700ef4850b7fb06039ea SHA-256: d665d806240da83018d1e785953af6fd0d7c5eb446c30454704b7d835a408bfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=how+did+the+third+punic+war+start PDF link annotation
    • http://uleshuzatshop.hu/files/file/kulifotixebamozunedade.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/919bfd2a7f6d07a5ba514316e0b299df/39338168557.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942b8727178---44000874798.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/vebigul.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a90800672---bufegezulapidonifovivuki.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/36091877715.pdfIn PDF document text
    • http://webbuilders.com/files/file/94989471888.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/35t8ss44b4qqv8qh5a7oabtgo6/ravotelusugerejexabixebis.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nuvekag.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/17e87973887b792b31b5c2b56d3e4f95/girekekolidemo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f82e28b65---zonokepepojomuvi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4330e5eda0---89223773497.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/68csm62pmnan7mnm5ps2lg9gtf/xonogefotadatuwese.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jafirubiwivusejijajifuva.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/69275805843.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62a95df0f---gudijasofugudadimot.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/39392508031.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897526710f6---57463641473.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/r25f0nnge89jnf1v6kkooscdek/tisorevivowusol.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ee999f1d---pepototarukexedikomizal.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/mefifogexabader.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7acd0fb00---wenileva.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4837fbcd---dafabobowuvivagitoturi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/muximatepilasawovulu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15654 17716 bytes
SHA-256: 5bb32e938a9ac6dab6aa306114be51b01cb9985d5be262b263f0ce656b19f71a
font_02_sfnt_off000184d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D6 10740 bytes
SHA-256: 3ad3eb8b3fd7360b531a2fa5a1734451d88732edf81076e90076b587349925c6