Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa44438b5501fbf…

MALICIOUS

PDF

98.5 KB Created: 2021-09-19 09:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e92d6f463d25af056a0e7b2214061ec8 SHA-1: 25c69b0f1f68505098ca2e5ade80c038cb7a70af SHA-256: 5fa44438b5501fbf03d68798a8e8ea72b3c2e9edbb3aa18e442bd0c32a4de014
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, embedding numerous URLs that point to various domains, some of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=index+of+the+mentalist+season+2
    • http://jongauger.com/userfiles/file/10694042277.pdf
    • http://babijie.com/upload_fck/file/2021-9-18/20210918235847388920.pdf
    • http://lovesushiscv.com/uploads/files/37072171104.pdf
    • http://nuestratierrapremios.com/campannas/file/26544212897.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613901ba7a9d1---jivupeturuxugututodo.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc28e7b6---97257739642.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/72872088073.pdf
    • https://truckforceone.eu/upload/editor/file/51291310161.pdf
    • https://szekszardportal.hu/userfiles/file/xekakijuxeguz.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/12535372822.pdf
    • http://redigonda.it/userfiles/files/54979496162.pdf
    • http://indigobaby.eu/upload/files/zazanizugem.pdf
    • http://vektorma.ru/uploads/assets/file/fevef.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/telasapewuvu.pdf
    • http://kcemsp.org/upload/editor/file/desulisesip.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47ab43956---zizomisiwofapov.pdf
    • http://camel-republic.com/media/userfiles/files/95479647252.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138721fb741b---42541165575.pdf
    • https://jeneifogaszat.hu/cikkdata/files/fuluxomolop.pdf
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/bogufesivuxariwelutego.pdf
    • http://dienlanhlongan.com/upload/files/rodiwagimoko.pdf
    • 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_off00011cd0.bin
043a0b4536154df644184d549f136b262a518043d43311ae2082f0a4f8bf1996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 18160 bytes
font_01_sfnt_off00014c06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C06 16792 bytes
font_02_sfnt_off0001641d.bin
5dd426e2d43187757f4f70a21490b52e2e48bdcc1e8b72789f07b3f3ddf6b785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1641D 10692 bytes

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