Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0e255a313e7e6b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-02 09:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0f47b7dad5ecf7aee5d7cc2740a80b SHA-1: 6d37cfe518122416b5da82d1a10f9be3b918d800 SHA-256: 5f0e255a313e7e6bebd4c13758dd3c5d449356f14b33fd0d4447ea7a406afc7a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it presents as an image to hide clickable links, a common tactic for directing users to malicious sites. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest the intent is to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://spreewaldatelier.de/img/editor/file/57741648098.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2fb17f0496c1026376264db6c5634732/42232165171.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2adce77f---jaxutujitizebitologa.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/52082696080.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/fidevewu.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/200eaa5eb6534ed476e35e39d35cf11f/bigajuputivurajirug.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/85016010552.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/60125561626.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ll9ug5lubbakv6p0vbdv2p5spo/botamipepowezaf.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/29622469654.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/20812478411.pdfIn PDF document text
    • https://roc.mn/uploads/files/masuripinudozo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4a3183f5c14c1b730d2dec0254d04270/rifiwaxapidale.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1061789b86.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/supokisamowibotijawabo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/izugufeponajotetipisufo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bef1816552e---32664704149.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/mutixubafuguvanavemeze.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/meduwowukuweki.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i9t5f5bt9onqkdjes0kummt063/52225290273.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/manatep.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/62788916463.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b094d87bfe324a20292dd88a3edeba82/nerox.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abc1f77b17b---rapezoturaxetip.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/81632826015.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c35e867b5---lugixuwodinisulefupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cs+interview+questions+and+answers+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_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 10876 bytes
SHA-256: 85eb8cadc058d9543a88ae0a13d862e3c5df8daac64dac29ac88f0d15824ab76
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 13280 bytes
SHA-256: 90601c2a43f6df9e6c129d3cf656eebdb613d4f10fb67a12df22d813908d5d87

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