Malicious PDF — malware analysis report

Static analysis result for SHA-256 362ef957b6ca5bde…

MALICIOUS

PDF

85.1 KB Created: 2021-07-27 08:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86274396a69037cee329dc00c43e95ea SHA-1: 971529c69a2c6e94599872d87f24576d1d453c4e SHA-256: 362ef957b6ca5bde2a0cc0dac2824980589cefdcff00468a9f95b392c7a83f4a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is unreadable, but the heuristics and URLs suggest a phishing or credential harvesting attempt.

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a37630a5---dekejufogevivatu.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/49584d993c8e4424319d09280d291d05/98867919163.pdf
    • https://www.avantagesapp.com/uploads/files/vijuv.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/8a2024367c079dcdc1cbd3655f1a7152/99788647693.pdf
    • http://birnagarcollege.in/userfiles/file/67113538863.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/57667796943.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98358e5f38---53348030945.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b9b643507a8626af646fa10423711985/welokat.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/sagerizolisukamuroni.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc842caaa---mobakojozudiv.pdf
    • https://shindah.com/images/ckeditor_img/files/tigagebobofavaxokuzaxumi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5d227ad4---44804544351.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aebd674a2---55674737371.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e297ced4---koxini.pdf
    • https://vibangthuaphatlai.net/uploads/files/xivabet.pdf
    • https://liniagdanskzydowo.pl/files/20081075844.pdf
    • http://1qjd.com/upload/files/2021-06-25-07-19-06-efnKh6Sc.pdf
    • http://crystal-lamp.ru/uploads/files/petarujozevurat.pdf
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/kaxurolexebunefikag.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/94f17b693b4d4608150032501bb83f9f/82767897710.pdf
    • https://cobaltinc.org/userfiles/file/raxoxilo.pdf
    • https://charterboatdeliverance.com/uploads/files/rokutopugorusanokowep.pdf
    • https://consurs.ro/ckfinder/userfiles/files/72868326115.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+ssc+seat+no+by+name
    • 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_off0000e918.bin
a7a18eae9ae127aad6bb4b0bef85744232d34d2a2f7a38688227308accb9601d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 17048 bytes
font_01_sfnt_off000115b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
font_02_sfnt_off00012dcd.bin
f7225ba61434fb5c740b0e3f947b6d4546a1dae1ea78939f166f753e96982b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 10820 bytes