Malicious PDF — malware analysis report

Static analysis result for SHA-256 729e3548202e50e4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 00:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab3c69a6ba34d0d06d4eb7d8adbd0dea SHA-1: 67f04737cd7e3d38e165e6d07c13d220d40e083c SHA-256: 729e3548202e50e44b6b30aece69733ac6899b0f1bfde81a76da503a79781198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://bookatowncar.com/userfiles/file/lisatuladexezesejivaf.pdf In PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/33734047687.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607570d7cbfd1---lagimo.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/riworusomerugogenotuwol.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/nowowowejiko.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/57e8ff552b129b720221c7a4b2d81446/koxugufudumur.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/54drpjugca4igsm8hlvt80gkk4/92651411125.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/morodawapuliwibawixa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610697d017f51---mafotej.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2dcb62dbc3d5d721f13b59b2df30de87/53958853621.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/82720004306.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/depofogega.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ae8a37d---rigewagivamojakep.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zobin.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v1tlfbotou6291ltp5uv2pe4ra/88087206790.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/22336604481.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/84419311051.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f687363e---55502471657.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/40140667579.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-17/20210517050140647353.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/628c7eb8dd6aaa855fba6bbdb0b013b5/fitan.pdfIn PDF document text
    • http://vipdiler.ru/files/file/wanojafozowigimiwilonur.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zububijuparaxeki.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cf4baa04---bomagitokasagikewagiguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=delimano+50+in+1+multi+cooker+manualPDF 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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 18912 bytes
SHA-256: bd6ec52c7c2dfaa94e03ace8da08020c23d9c5b2ec08b958b59f6e87b9a887e7
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10724 bytes
SHA-256: f06d690901afbad1a82ab417cf370d9275e0e708a5f6a7b25e7433a76394cfee

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