Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a5ec496f80f824…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 16:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b512b330247d218b653c1957357d6c89 SHA-1: ae59749e504b18399d2ed7a175f35fd8b5674ee0 SHA-256: 94a5ec496f80f82459aa37c664a4c299ee7ce4afd720feec49700fcc75d2fa14
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the PDF may be part of a multi-stage attack, potentially requiring a password to decrypt a payload. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=movies+box+hd+app PDF link annotation
    • https://tasivn.com/upload/ck/files/witagafor.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/puvegena.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/3152013613.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/vaxufufasexa.pdfIn PDF document text
    • https://attack.lt/images/files/13339475803.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/34567988305.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/92842586364.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/xiwune.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161310eb99e7ff---13013627498.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/limotuxu.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/5559173814.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/wafadigaduwefug.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29255154241.pdfIn PDF document text
    • http://safarang.com/basefile/files/pabiraritinutoxinofugisok.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/4675695837.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/80323026685.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/99516983219.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3713c287b---10784073480.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/34326794076.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/kolud.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/jisogamewuwup.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613114ed2f614---sepab.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/susezonutovoduro.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xexinomesasabuwino.pdfIn PDF document text
    • 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_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 18016 bytes
SHA-256: 2dd4aa9e11b616b0012e4d87d62412b1046d3ea49305e57944b75603f987be8c
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 10444 bytes
SHA-256: f9978d432352e6ebcf72e4017a523e2cd836c3eb0ccd564e90baab603fc46944

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