Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbf2658ca19596f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 20:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e7975959107f1ffba8b4ec4d6d21917 SHA-1: 82872f791853f3e860e3bc7fd04a60b393d6987a SHA-256: 4bbf2658ca19596facd236065f3bde8873c08b26cf8441c51b7906be82aaa8ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. The document body was unreadable, but the presence of many external links strongly suggests a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tatnhapkhau.com/ckfinder/userfiles/files/31745790832.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608603875ec0a---66800016002.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gibamovafepab.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fe0fdff54236e83a73ec7ad0a0d180c9/32069025130.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/tozasotofekadesosug.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d0b33c1c---49735823590.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/h1eujmeooq4vvveeca66p8jcve/29784741979.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/ruvotasep.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/sezixugijizaxokozos.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6046ec1f19---lamipebasa.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/muboxazomisatakulovuk.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b241f7c6ee4---99698704194.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070da2c140c5---jupokozoruretipusuxazokag.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/zutudapofepobutel.pdfIn PDF document text
    • http://scpt.it/userfiles/files/foxatubewi.pdfIn PDF document text
    • http://chamdure.com/DATA/files/zakafunagugogigip.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/94052836943.pdfIn PDF document text
    • https://kede.org/userfiles/file/rozaxekiforu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/istrd1drtr9684shhegdre0356/xafarewovafidekapital.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/bejukedosomibodujer.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/65282308624.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/zipoxubuviguzukiwevaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mechanical+properties+of+materials+nptel+pdfPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 17464 bytes
SHA-256: 766ec78095003b9e7c23a8a0f76a3a671f85d9f1082a52bd656c57f1d8ec883e
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 10880 bytes
SHA-256: 7359dff188d3ea574725fa200db9b05c1474c206578252529e9e228b869e04fa

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