Malicious PDF — malware analysis report

Static analysis result for SHA-256 634e57d5c0ce7df5…

MALICIOUS

PDF

83.4 KB Created: 2021-07-16 18:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb1d1626c8a9da1fdc33a7514fc3c8e8 SHA-1: 56c55c585f636b89864e5db104d3b6f2a645c6f6 SHA-256: 634e57d5c0ce7df56a841b6abe8b58c212d0342d18a3d213210cc22c35086a7e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kondicionery-fryazino.ru/upload_picture/file/jivarabejo.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/93b0287b7501459d3104dda91c326ea8/pusuxagifo.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/40590564805.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a89a663f3cf6dc04b7071883fe44560/4214322775.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ef822ada1abf5ba6915c7474cad6efda/51079847417.pdf
    • https://avonsteel.com/UserFiles/file/82307875879.pdf
    • http://gramercygrand.ru/files/file/tokemuwesifas.pdf
    • http://austintownfitch1980.com/clients/879833/File/95552967072.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e373c4b1c---42033830750.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1afcdeeac35cc4bce80e511d4c0bb5f3/42357108174.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/68571443629.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6082f27---ripobilugugakufukeso.pdf
    • http://artin-intranet.com/ckupload/files/82861472858.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a6490b13b746eb877d4b3e376a0b1295/23344939079.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/52337151698.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3vf14frdsg5h1adsd9bfaierjl/lukodugos.pdf
    • https://tantecoccole016.it/file/71894002263.pdf
    • http://hi-techfiber.com/userfiles/file/panakara.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/405emb9a6bncmeb240jbtikq6u/lonisesaxusek.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3a0413121dd51e8c2b0703e18fb0259c/5401908472.pdf
    • http://tkvolley.pl/upload/files/30055847238.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/19074374309.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b691fee1caaaf9f392530fe127de2d1a/ziwemupazosemero.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ti+and+candace+owens
    • 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_off0000e18d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16792 bytes
font_01_sfnt_off0000f99f.bin
0233e3f07029861dc21dfef751fd18e59a74b923496b55a711b10a42d2bf823c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 18032 bytes
font_02_sfnt_off00012858.bin
7e8997fceaf71e4b516a09d0af9c874149c4c99ebd9360d11e2484fa26aff723
pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 10168 bytes