Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6090313104a46c9…

MALICIOUS

PDF

121.5 KB Created: 2021-07-18 18:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e8dbf80adb785a983c7fe36f470646b SHA-1: 1175656399eac5ff272b4e8046eb43ce7ddc6a18 SHA-256: c6090313104a46c957f0601a87e849bdad25b09c8e1ee93e54b1dd7aa0e7f68e
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 or redirecting users. The presence of a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicates a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://forumhrdbekasi.com/webroot/userfiles/files/48610502130.pdf In PDF document text
    • http://blow-w124.com/js/upload/files/29304576567.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd523c8da69---58152045407.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/4h5ao40bmlnmor0msgep1gbsl1/redukenadajo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/lonulaxiv.pdfIn PDF document text
    • http://keitbg.com/images/files/xirokivuvex.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vezuxuxij.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cc10142ffde5893880424b0a4dd6c25c/jajuvagidovamixusetap.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/mibamejeduzunobe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160999c22ece58---wenajaferogine.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lqiocbja7eck5a4v4ob21eelcq/17267495194.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/80689563420.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e1931ddf---47839330572.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0ebea7cd---pivawejuwot.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/322fea66b5396040fe9e455c2f3c7c34/bovesuboj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b338a634cd---1014357401.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nafozisokarigubufolimini.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/lomerirun.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d6e13b72---88813506644.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c974cc5107c---12479122989.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ccef12a81---nutusopamebuzinuvu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/10rqg06n5pqhi59n1rmdsdav6u/3132821096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=swollen+salivary+gland+under+tongue+treatmentPDF link annotation
    • 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_off00017683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17683 11032 bytes
SHA-256: 1aafbd72545f28dbf8e5605a6c41c4abcabb3e36ced0868ff04ce1519b52f09d
font_01_sfnt_off0001900b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1900B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A81D 18372 bytes
SHA-256: 70adcbb5dcfe91b2e162f197f6497a7179cf220e728ca9561294c263a89b13e6

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