Malicious PDF — malware analysis report

Static analysis result for SHA-256 1000dabf4cd431d6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 15:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be83aad299bfcf2773f14a88b9b56745 SHA-1: 7df55d5624eb8774d77d3bca2d695b38e6b4c7f3 SHA-256: 1000dabf4cd431d6ed97a8a27d457b68878cc7dafeff3e07fff51d6383506837
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://edarky.net/data/file/malukajavijozopevojaxu.pdf
    • http://80tner.netsociality.com/upload/files/53889525056.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161386aa882caf---19874944780.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/juwofeloletexuxinexomulo.pdf
    • https://mkserwis.pl/userfiles/file/kukobofuse.pdf
    • http://bright-inter.com/file_media/file_image/file/sumujubevubumejiz.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/rajekiwomumulofufimorupa.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1e71b2dc4c0c569da26329b223f18d4e/bowowovakubobonotuz.pdf
    • https://bhsbeacon.com/FCKeditor/file/5278796344.pdf
    • https://fivetc.vn/uploads/files/75613046293.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb16598b0---rovozojupemusovakuzubup.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/615445f7ca43d437a51eebd1e0c171ca/netatarodolege.pdf
    • http://tianlanip.com/filespath/files/20210918044559.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a2163d0c9204eeb806a50b2c2182c43b/piwugugotuzezanumunuxepez.pdf
    • http://comlark.ru/userfiles/files/fusewedorevuperujus.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8824808---jujiw.pdf
    • http://myphammonly.com/luutru/files/devatomeruwokozuso.pdf
    • http://hstechno.com/userData/ebizro_board/file/72310586026.pdf
    • http://ttmplus.com/userfiles/files/38971458765.pdf
    • http://jaluzipro.ru/public/userfiles/file/gusikeriweso.pdf
    • http://motovelo-nmsk.ru/userfiles/file/91365167251.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/40955439581.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/81894368952.pdf
    • https://panelshock.com/userfiles/file/fowarupagezi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=time+picker+ui
    • 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_off0000c9cb.bin
00aca9f5908cb2de73648af21bf1401b491b39e10e459e627b9689107ff12935
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 9992 bytes
font_01_sfnt_off0000dff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 16792 bytes
font_02_sfnt_off0000f802.bin
308be6ee3146edbc18e7e907597359fe7685417204ecd684c3d14fa403deb14b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 17000 bytes