Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d677cf01d15cddd…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 15:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f87933ce75ec417e2e57bd4c368d4bc SHA-1: 91538cd52b7e77beb591cfaaad650e9bfaa177d9 SHA-256: 6d677cf01d15cddd1da88599a1899587029f223e5fe097ce747e294bac5896b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs that point to compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm indicate a probable phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ba04db4e9d7c02fb7af99106c09bf4fa/10499796848.pdf In PDF document text
    • http://gioiacompany.net/images/upload/file/vibofewarim.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tosopitifegonikefat.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/43695660085.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4f944f96---87596423293.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/loxubew.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a68363568df---99373994717.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/83488725278.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/wuvepudajiru.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/sujiwag.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/mapitefatovebomegifone.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160817b260c0ff---dejorezorowalowaxepurupil.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/sitawinixufunepawigojaja.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab89a6d7df---7817939650.pdfIn PDF document text
    • http://mp-journal.com/media/file/86435088694.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8f85f328cee451487864b73f030bfe8c/64816089206.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/jikabixafunofera.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2qpb1li5gtd85fc358vjt91t28/labijidoturijonebugud.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tptstqiiri4tdhmduf7eueml82/86714195028.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f82c9d5f5028c0c650f713d7584bae34/tezubokofina.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acaef08a08---93124076499.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c8538a833110ddeb8eac348dcee8c42d/39514963218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cms+reference+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_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 17984 bytes
SHA-256: f63835987e6e85aa46020b622bb49e39c5347db857991841e539141e0e6278ff
font_01_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 10316 bytes
SHA-256: 5b8f15ab0d5284e5883fd9cf2e690739ac338e542875f2f9d7a0e0eb37c04c28
font_02_sfnt_off00013572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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