Malicious PDF — malware analysis report

Static analysis result for SHA-256 855602c626c15109…

MALICIOUS

PDF

123.6 KB Created: 2021-06-30 15:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 474a30ac136470abc67865b4c6fa9e52 SHA-1: e2a1c5a7d1415b4aec35c91d8fc37a293210b447 SHA-256: 855602c626c15109e7a9112313293060cf31be1d039e08181a8b1716e2752f27
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/60e42b1665aa8f61f8ae8e5f6e49289f/77347910704.pdf
    • http://aldo-ins.com/userfiles/file/vidazikedumezazatajabe.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fc4ffd255987643f5c20f32e33ee5382/56962927005.pdf
    • https://llsindia.in/FCKeditor/file/78663789396.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab1dc63298---jajurusatogomepanarew.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608448cb7cf58---93204351731.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077142650526---69059486034.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p17nnjm33n001493kvmpfuldvl/84706929153.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7bb15d911cc11e67198709fc98f25e1e/kivusi.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ea2a3f067dd5def47fac2e9732bd41ca/wavuzubovagukewijux.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d70c96840ae3069c9e73f3e8e93cb74a/ximozizon.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080def506bc4---kiwaxodopesop.pdf
    • http://nedirajtebosnu.net/userfiles/file/gamoxokezutumoperezut.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e60d4ba7---vajukimezevemulifib.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160888914adb4b---janejoxitajixirewunisebo.pdf
    • http://ed-web.cz/userfilesfile/93116546932.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2d80a4543c49d550c3ddafdaa2962b50/30529398981.pdf
    • http://smartvoicecom.com/userfiles/gewibuwetelugubiw.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/26213035550.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077c97c08e2f---57374226081.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1d590f65d74f03a03536c57bd78fab96/bubodonekesuvuzidavit.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/49147620630.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb04cc694---91331675948.pdf
    • https://menu2uplus.com/images/file/pobobabovegebidajutola.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c15a2f51---wagozosufiwovosisuze.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f3713089548b2ea21ccd9ef7408a6c44/xidasaxopu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=components+of+physical+fitness+and+meaning
    • 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_off0001800c.bin
46e25e9f41973db6b7b52d3f289d28d751b76e9654a1889f9fb0beb0b55d9391
pdf-font-stream PDF embedded font (sfnt) at offset 0x1800C 11112 bytes
font_01_sfnt_off0001999f.bin
9009617e9b0b46949a69801ff5dad0fe7afc0e1e5e7f4be1f43e3adfa3f0d175
pdf-font-stream PDF embedded font (sfnt) at offset 0x1999F 17792 bytes
font_02_sfnt_off0001c83f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C83F 16792 bytes