Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ca0c2cdb37262e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 11:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d52ad3fa2b94855a8f13164c03ddc4a1 SHA-1: cdf8d25bf0f3e4b471f19f87fd176b5bba4410b6 SHA-256: 31ca0c2cdb37262ed991a371b44ac6c7d3cdfdc0aa24fa77c04153793f455901
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=chasing+pavements+lyrics+pdf PDF link annotation
    • http://watthaistuttgart.de/userfiles/file/45834233987.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53f5b56784---pezuworosatelot.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/99162925432.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8a8a81c106452f0b66fec8d176b91626/85314380853.pdfIn PDF document text
    • https://patc.fr/imagesfile/30160117647.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c868403b3f9bd6fa72631c216dea1012/19115147369.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/geruwokovaw.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/87723655306.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/20ca35a34e75612b9ed29038e5a5f83a/25622542157.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/rikar.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f021aae5447---37466385286.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/30765746662.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e46669115f1---34890505624.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210723075456.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3887459f3ec7eaf666e1d060e426604d/vedosegabobabefogokaxeti.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/41003241813.pdfIn PDF document text
    • https://alutat.com/data/file/89645535220.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60df181cd---wuvuba.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/38052474853.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/jirifelevixipugepimimuwi.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/vitodaw.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/komisolotedodefo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611792d183e95---99482142004.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/berijogadig.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/dapapijoburekobawelilu.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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 20656 bytes
SHA-256: b6558a924ffdcae8000be6ffaa0b65a3a1c1db0abbdb001d121b1c5fa67c2a27
font_01_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 11160 bytes
SHA-256: 278d3a8a5c45937001288dbe391ea3e72ae20e5816c3d3cc8bf5fb36602f6d12

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