Malicious PDF — malware analysis report

Static analysis result for SHA-256 2961aaa7d2006e18…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 07:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aae802e2fd10a5bd5fcb2c034d93057 SHA-1: f95af696f0335b98037e5af08ec0ae7ed100d0d4 SHA-256: 2961aaa7d2006e1860128ecfcc07d845e9075b72efc139a40f0b21ae73ab3a0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised. The primary goal seems to be directing users to external resources, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://healingtown.org/userData/board/file/nexenusebekuwasozaw.pdf
    • https://szabolcsipeter.com/userfiles/file/zaselavu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131434551f61---55716314851.pdf
    • https://espiber.cl/images/uploadedimages/file/89692117982.pdf
    • https://sambelteri.com/contents/files/39116501696.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b706c4fcc0---67554207308.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f015785fe4---24562058217.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b06a1170---72494405310.pdf
    • http://dakov.hu/_user/file/97253110546.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16133a85299aa3---begivetiguxiwosevo.pdf
    • http://arci-mp.fr/admin/File/fejorolabokaxixozomidesum.pdf
    • http://amkchem.com/upload/files/boguxejujo.pdf
    • http://kovospm.cz/fotky/file/25245584945.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/zopukujirulawiporokuwevod.pdf
    • https://landatur.com/files/galeria/files/80978685030.pdf
    • http://trieuduong.com/images/Download/36528822741.pdf
    • http://majstrissmt.eu/www-data/file/82935708672.pdf
    • http://modaxch.com/userfiles/files/norepamalov.pdf
    • http://safiorida.nl/operatori/userfiles/file/demisugime.pdf
    • http://liburnia.pl/userfiles/file/48151146020.pdf
    • http://studiofapas.it/userfiles/files/kakukemawigujosaluvinamas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=think+big+by+ben+carson+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16792 bytes
font_01_sfnt_off0000eace.bin
54e21e028d5447e6899dc9f6aa2b3cdd9c4fe38d247de20ed8e5a5a16cce8bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 11196 bytes
font_02_sfnt_off00010493.bin
59a4b97d805617a5cdb3c1c0e8f30474f550dd84e2177136a9cc7d821672b75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 17560 bytes

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