Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6962d165d1149b2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6b1ba5bd2ae07c9716fa373218c1202 SHA-1: 9bd3c168a377feff6b7c1101e86f80e9d554d1f8 SHA-256: e6962d165d1149b2cb894da7328b181bbbe136c614b56c2de0bb1ba133493b5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of a 'Fake invoice / payment lure' heuristic, combined with the ML classifier's high confidence and ClamAV detection, indicates this PDF is intended to deceive users into downloading further malware. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=river+flows+in+you+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4ceb2cefe---71314427078.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/58114851673.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/debibaf.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9e68c95ea771fe69a90684436a674c62/15722722505.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/432f5b59e11a693f73cf379b55580589/doragumuvaze.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5db26d519---82276517885.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/09218027015f8eb4e1b4dcefa0bf863d/reniwifotezolumodegifop.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/grnd46dhics5mid2flibgepje6/zokixixixopoviwawew.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-9/20210609153532473031.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/3109946250.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d42d82e4f7f824e64e5e7cab852978af/12612181273.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092848a7c155---sofofen.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/laxusifawig.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/70651205114.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/24745966575.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/nekap.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1e838201ef12a61d9361fdf301e561e6/selizewobobigeveni.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/33665697063.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/85670072924.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/94605372050.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/68469506839.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/wejiro.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/55381516690.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/fokajepatunozilenuxaw.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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10640 bytes
SHA-256: 23af8534e8063bced7371360113f0c87c1353c8948042d7e5bf7aa6fbe56876b
font_02_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 17648 bytes
SHA-256: 54881086da000f1ffd69227ff3c8db7a04038621ac96e2091642731304e8dd18

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