Malicious PDF — malware analysis report

Static analysis result for SHA-256 042d850e9409596b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 02:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98461843fb50f3a46dd743ed19098879 SHA-1: 9294135afe2715301c9de8b3da6e7cd6d7494c80 SHA-256: 042d850e9409596b06a612428872d21ad4fbfa8d652fbf47099b6513d74527ef
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a malicious payload. The document functions as a link farm, directing users to compromised websites hosting further malicious PDFs, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to distribute malicious content through deceptive links.

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.
  • 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://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/91721979229.pdf In PDF document text
    • http://tnslib.net/userfiles/files/kavozalureninivozamekix.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/53383705953.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/7375732916.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3222bcad---rijupilegebixaxe.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6bf7b518---52783423831.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c3767d578086e98ca2bda0d641c3b45d/78152517674.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebdd800f95---wofekepowuzesesurirexobop.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n0775vvctj0g35bq4pnmtil2ck/57356401656.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a9bca7af58d361d98eb4f4baec348d82/budarir.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/50381601328.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d893af1b48---98330524155.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/88454164588.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/42254435884.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/97baffaf1a6958cb40cee40adf2e806b/95067938639.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/nawut.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0420adbd---duxojedidofapebakujovap.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/xufaz.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280908065369.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/4f08635a0f8684fb554e5ce5fa998f24/jexuzesavaruradone.pdfIn PDF document text
    • http://inercial.es/uploads/files/69894240886.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/todarakuxasama.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dae41a81f2c6847bf355eb5f476512f8/gufakonimorijulegizazujiz.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chemical+reactions+in+our+daily+lifePDF 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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 17584 bytes
SHA-256: 69904a5918bf729547dc1408f1cea02573e9c29347e2a0c7ad52b4230fa00ef2
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 10984 bytes
SHA-256: 0963f71b54776e4c70045b704fcb9e38848f7fdaa84872297683272b4339d6e5