Malicious PDF — malware analysis report

Static analysis result for SHA-256 f593b367c00f0204…

MALICIOUS

PDF

70.4 KB Created: 2021-09-01 09:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28c149165184142d6a5586b22b9f1ec5 SHA-1: 53133ce468c85f6bc7883aa604475e1194277316 SHA-256: f593b367c00f02044b75b8df9af02f8871b53055f6ce2acc65fba01303dfae90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 70 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 https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4c6810df7c3a4f3ae56c0fc58f8cc8b4/kamapelogad.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/badofetisunu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/zakobupemoge.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e54f4299e6---tiporizanodeparizekaf.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/18447211771.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/35698479076.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/vogajizikonexuxeg.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/82252231721.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/269ceb079774739d9899ee2142ac960d/befagimo.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/63201010804.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/93647487248.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/53079657031.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rmdqofa551gk1khq9dna3ul0o4/fumununawasoveb.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a2b17e07e3b25ffaa98b97fec5aad0cc/85889634520.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/86845834769.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/fogaduleforebu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ed0cb8662---96400106052.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/opvi4hksfolggkf4s8ac07tlnm/wutonifa.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210618_E5A25585EC8D5D3A.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/migedo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ff9141a97---18031901076.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/jomamudisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=is+frying+an+egg+a+physical+or+chemical+changePDF 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_off0000b75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75C 10896 bytes
SHA-256: cf667b899ecbb5f4b0857e8be81943fe029b68698bfd82b229ca8e90d8eb84e7
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 14160 bytes
SHA-256: ccbf321bd7298501af34e49b411cda7098782a264852dd7c603229ece71066cd
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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