Malicious PDF — malware analysis report

Static analysis result for SHA-256 062c523661b2279b…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 852d7a389e1b5a152a8ea1680b9d8a94 SHA-1: 83c4f45b0a6ebebbcdaad8358cbb10da1ecc2ce4 SHA-256: 062c523661b2279b2a6f264231930f25ad4e2c7eb5742a3266d0f2730b61e5a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ncvpte.in/userfiles/file/97734319638.pdf
    • http://mlsy.cz/images/file/files/faxidapagunese.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ff34eb2eb42f5b6545127906fd7ce1a/xezimeditefep.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/eokqmuogb2r12sl16phel8i5u7/32799786156.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/43422664680.pdf
    • http://dioceseofniranam.org/userfiles/file/77469713464.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/323qq0lbv1eovjra0vh7ptcthk/kinesakekozajude.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/irpnr6pjloo7e5g35m91jb2f3g/vevapokedananarukinudem.pdf
    • http://poltinka.ru/userfiles/file/nadefopuxokorijot.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/eee7478bba0eb54ca5954344be4c6025/riravubi.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42da3b9f1---xezegosudekapebabevovisak.pdf
    • http://alituncer.com/userfiles/file/51165177006.pdf
    • http://aihyang.com/userfiles/file/vilona.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384eda6f94---pigosasiki.pdf
    • https://media-get.com/userfiles/files/42279687159.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60a02876ac27f1dc838eaceaf99ff9ac/17618705600.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/psnu3ofqm36q21pfr3nu1et2u6/54932608740.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed6a8313e6---37331153343.pdf
    • http://artside.org/data/temp/file/87254749846.pdf
    • http://yishiweb.com/upfiles/files/20210623_010320.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1f756e115675446095b551766c6906f9/wufesu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chin+on+chest+deformity
    • 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_off0000e3a4.bin
b93f489d5121817fa83477294b4f9a746f6a417a079ce3dfa414f702c2794c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16796 bytes
font_01_sfnt_off00010f70.bin
ad6acf4b67b9b2f866d9db08c5b2b99aa7b5f7e46e2fec0e93d69ff77dc600a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 10680 bytes
font_02_sfnt_off000127c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 16792 bytes