Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff321a09b3dd570…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 08:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e144da58bb2ab07a2ea3b5a700327cb SHA-1: 3102225675d7e3bc7834a56453e97d047ddd3d80 SHA-256: 3ff321a09b3dd570a4afe8803f51203065e4a4518afdf7f2737a90ac3a62d0f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to PDF files hosted on compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://podimercrm.com/img/files/lozemafod.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/89850461374.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c2deeac1b24d0b612a890f8161ef0bd/72618786281.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/95740318158.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wexovux.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6b06901f9f3dd2b1c9b54776c68d6cee/94596843389.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cad7d5376---suxolurejisijomulifej.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/babekefi.pdfIn PDF document text
    • https://tl-systems.hu/files/files/98366068069.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086da13822c8---46497592929.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/guvelexenafejab.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/sowiwuwugobegefirozo.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/mowebibaku.pdfIn PDF document text
    • http://slsnn.ru/content/files/zukulikukugigu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080812081595.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/79949910238.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77e0ce5999dc5f721fee21174ca676c5/gutanimuxub.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9d8c27c4eb0286aee8fbfcfed1b6b003/64402184772.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d75a9235---nukumopojidifimar.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/8056598509.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124ef5a97b3c---nibebugofopo.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/10068864323.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc745f74c---49057555775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=canales+de+distribucion+internacional+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_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 16840 bytes
SHA-256: 2c3770d83e728b19d3a5aadaff1ce99b60b351dc2427dd8daca237c6138c02e2
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 10884 bytes
SHA-256: a488547114bfe4c8ce1140905c25f53f70a31f96c308d1c631dc2a13f4f03ac3

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