Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc1165ecdfd9726…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 16:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04ab78fea130fe773f01a60092bdfd04 SHA-1: 98d8a854cc2f462adce76a207c1a3291ce40f7d9 SHA-256: 2bc1165ecdfd972668e1cee9e87d85518623dc9bc36f203f62d14530d7561234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous compromised WordPress uploads and disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely related to initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://liniagdanskzydowo.pl/files/lepapilog.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/desivebakufukekovuku.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66df6f1a0350e622e5ccab78be5a3299/wefijitadarajunepev.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a85c49ef29b4cb797c4b67ed65769f4c/53118625765.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4db586a5---37804666346.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b49bc2dda---20765712957.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/34c1b860a1454a0aa836154c92604f79/jizimejikosixomimunaw.pdf
    • http://arredamentoambienti.it/img/file/31533257823.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/crrtbj3dkrdo1lbv8jq00mtvn9/mefad.pdf
    • http://www.cbs-emballages.com/upload/file/xebafaxun.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087742704fe8---4177958669.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/m6g6r3c7n7raphime4b8jgt6uq/82598076561.pdf
    • https://bevelec.com/bevelec/dossierMois/file/fiwafisa.pdf
    • http://ankaser.com/userfiles/file/78049458874.pdf
    • http://3sdent.com/upload/files/zitigamekiviximatu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da758473ff---jisinowakolaziroxifojiz.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7f7fb0948500b50206f4ecc6f19b2e8e/fovir.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0852c1f4e---xuwetemamomeku.pdf
    • http://fw-simple.com/uploads/files/fifatepe.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b017c123a0cef6a713ede7ce09dc7638/susubozuzuvonutumeviguraf.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6tbliacfodu881go346ihekv03/43287731854.pdf
    • http://deltastal.ru/userfiles/file/wakarivakirimedu.pdf
    • http://marinapogon.pl/upload/file/linukapefu.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/85c9f58d1e267e966a562a48374e64b7/44594061209.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3d5o2l6hitsgteh068e4shnsir/89703985752.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/04821e009a2ec031dd20fa8f0639ed27/87018143218.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=clinical+features+of+coarctation+of+aorta
    • 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_off000105fc.bin
56bbdec08f5de8654e4e708cd9640b026409eb8d9e3d6a40c01946ed19762c95
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 16668 bytes
font_01_sfnt_off0001316e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 16792 bytes
font_02_sfnt_off00014985.bin
db9de8d18b1d5ee35ade419563910a798b838798e8f7c4a42981e816631d3a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x14985 10460 bytes