Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8592431f9abe6ad…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 20:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab0c7c9e967868c8180ebad11ccbe469 SHA-1: d36b4b709f5be05bf244a4c79fe5d8c28de4edad SHA-256: f8592431f9abe6ad0a962290f7ed3ca66edd6f81f4fa417839e03c972174f829
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The heuristic firings indicate a link farm strategy, suggesting the document is designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c57e8dbd2---gipazovuxugafemunenanozob.pdf In PDF document text
    • https://glamweddingdesign.com/userfiles/file/67496205574.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c2b22c7ee11bdee19827e41603883156/kidere.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/7371774914.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5fe2ecdaac8535ec5e7ba49bf29ba86a/ziposemon.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/54512733032.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/92003458714.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/73233113305.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/98010269496.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/joxojajusonupamiwofegufu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613964fe2ec4c---34164474088.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/femuriwimuwafojibelem.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/61188775058.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/dusenafubetu.pdfIn PDF document text
    • https://ibextrail.com/editor-images/73285599577.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/kinidovil.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/xixadefojavam.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/zigap.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/39812210520.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/muveviba.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/31536683454.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/34149856690.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/porekazaxodekagifat.pdfIn PDF document text
    • https://iword.de/userfiles/file/23356031535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=most+recent+my+hero+academia+moviePDF 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_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 20096 bytes
SHA-256: 88694f31193d03061a8c0686b9fd7adeaecdbd521fa435897fe43f91b675d6af
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 10760 bytes
SHA-256: ddfb5824fea3b356b8d166f04315881156c8aa664c8e7c45c81e2962580e2db0

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