Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2b3d0364417c00…

MALICIOUS

PDF

85.9 KB Created: 2021-09-24 04:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64177e0f447b929ae4b1dbf4535bd8f2 SHA-1: b5dcb659c9d9606da7bb019da2ae07881322eb9c SHA-256: 8c2b3d0364417c0046f40b5b311d319ebbed2bc916a84ecec8b8256d08d438af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=how+do+you+cut+and+paste+on+an+android+phone PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a89ebc074---23535086237.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b68eb29317---52197712013.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613421db73b86---76930258209.pdfIn PDF document text
    • http://bamor.org/userfiles/file/51079548920.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614a405e55751---fupusulirinopadupekibut.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/vitasowoxikixuposupoki.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/64084308701.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oj5j3glaervc2uln222leka3g5/98071060062.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/55343906850.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/2658535056.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/37944683165.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/60924274563.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/65107401523.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2288947526.pdfIn PDF document text
    • https://kratky.eu/files/file/39329349789.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/vifibetolixomakibizoligo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i4u2doofj69l7h80v14l8glrc5/keporuvoxirugarijut.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/25808683912.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fejatiloremav.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/26256482873.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/41300488022.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/kufug.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xifad.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9c364be5---rumajotisuxulukidofawo.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 17620 bytes
SHA-256: 3b6a176d33c47692a0d542571d6eec3da9281b97cdfda469bae3a61a28fb0484
font_02_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 10856 bytes
SHA-256: a5be4f19a94136ed040384bff4bf9350281a8a46a508a1c92db391149954cb1e

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