Malicious PDF — malware analysis report

Static analysis result for SHA-256 118f13529aa7e2ff…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 09:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27cc141fcf06393bf519bd4b0c65c475 SHA-1: 08cc2e9d4ba780a0b2a3abff6ca630c9fb7f94aa SHA-256: 118f13529aa7e2ffde7dfa20088c4d6790396cbb617c180557c2f0fea1324a77
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-only document with a clickable action, typical for directing users to malicious links. Multiple heuristics point to link farms hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute further malicious content or phishing pages. No scripts were extracted, but the presence of numerous external URIs indicates the primary function is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 68 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://campingwithconvenience.com/files/files/73130826443.pdf In PDF document text
    • http://studiocalderini.it/userfiles/files/botogamudixixu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bad0435d87ddd611511f51ae2f307e5d/keguvunodototezojeniva.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/jobajiped.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/bokopekemutunuwag.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141f97fb6619---94651751024.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/62439635132.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tizula.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/83305712141.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210915194838.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8b2044c5---gediwenexavipodix.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492efa42b95---kizapiripumebofiwovuv.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/mibozosomoxuripitokeburu.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/fesapefipujazajotu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486190d2820---29149470657.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cdc9abb2c4d820b570f309813bcf25fe/fukutofuxarudonubotigiza.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/71315863852.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/lutokij.pdfIn PDF document text
    • https://ratoempat.com/contents/files/sumuzu.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xifopesasem.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/53504ee9e06c6259ada086ab87ea7803/60161858437.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3b065047---84770519229.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/20559879410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tuneecu+android+free+downloadPDF 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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 14060 bytes
SHA-256: 0cb9fcbb1e612f16ed78dc723e5a316f028258a49de0b59a09f821ba2886258d
font_01_sfnt_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10352 bytes
SHA-256: dc5c2b4b44a73a334230b47f8acfb54e3fd71c69007b1c0ee78c47502cb08eda

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