Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bb4290ced4082f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-16 20:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e141a2de0babbbcf51df7151984eebfe SHA-1: d190037e9f94a9f9abf3fd68f990a59b380821c9 SHA-256: 34bb4290ced4082f17a1cea4972739cc19b0082c0b9e7086aa68eb9212112f38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to redirect users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://hongdanhaudio.com/luutru/files/1427476940.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pj6tmdm5q64u5q85poi89d7v5j/85012688286.pdfIn PDF document text
    • http://nktrading.qa/file/files/10072792596.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e96e6cb8fbc703d72dc6f51d9c36009d/70331853512.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/43285158179.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/11be1e101fdd1e5d4c05feac3e7ee65f/sifexesiduz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/35149087191.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cbbf2a12ec25c0b2c2a85cc1939bdf85/pevapipifijenorujevetuma.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/adb6dc3d335c6ab0cf1eef18e3a62ca1/51676713211.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/segugole.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8a0587ae---81599153382.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/97340991927.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/6151455022.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cea6dc23711---peremadajumewaxeze.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/31145270503.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/99675743391.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/pukiwirolusawemugeb.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/xawazes.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3cedbbe4---lozarijuwabise.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/72003781897.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/vamukuwogovosivusobenogal.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a04fad125c7046363ad3b799157adcc5/64927504152.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/pufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=2004+polaris+ranger+500+repair+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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 17220 bytes
SHA-256: e64140cfef2de1b7818762fae9f10d418d946a6fffddcd149b61e82f7b1d917d
font_01_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328D 10956 bytes
SHA-256: 94572a9ee1dcfa339be1c8da7aa0b2b1011cca703df4ac0cbf709b0da58c2fb2

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