Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b05c015717113c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 08:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c6dd2518b2ab1ad39c7c6823af8b83c SHA-1: 7c06fb8ea74c1dc52efbc236ed5a067e387db98e SHA-256: 76b05c015717113c194f242bec3847755c35f8ffc50c997e96f8cd074778acb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS upload directories or acting as link farms, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=bloodline+of+jesus+in+the+bible PDF link annotation
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3biqsr850c92nr89k76v6aco41/42250730272.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/75996144770.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74c288628---44813342514.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14887921841.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/11194959778.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/46720766004.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/lojolelutozunisagakol.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/13473697686.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/segix.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/14952578592.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b1a4b87ae35b701ecbf0adeec87ed1e5/lagoradis.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/47825227940.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090110100973499.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611972e34fa28---69141658236.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fvlg53pgp23bpf13in6vkco1a7/zukulazi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/gt3ptpulqqba94kto7oqnka08t/77182169485.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/rakefe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d5304a7b9521fce4203c28ea8bacccb3/26493175664.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e7e275e3483b2bba65a5b998bc9a0fd3/fifidujosusenadeb.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2c3876f2---69071433273.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wegito.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/615916bc299464ce4ab2098c25afad3c/51188656412.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/fesojowojonenezepigiti.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 10612 bytes
SHA-256: a00e4dbcfbb10cb8287659a86149cbbbd0decd1ef7db579ef38443216a3b6339
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 17460 bytes
SHA-256: 70d485eeffbf272c5385ada71d3cf70e30e7941d6fff0297ee8c622f2788f85e

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