Malicious PDF — malware analysis report

Static analysis result for SHA-256 88db7b3945983881…

MALICIOUS

PDF

86.6 KB Created: 2021-08-18 01:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa15b66354f6ac4974da6d4875bab12f SHA-1: 5f4c38c63e20af7a57e9585e8d1c7764fadbd735 SHA-256: 88db7b3945983881492c5518a643e99bcbcecdfe673c4e50b5e08303c89db50a
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=how+to+write+valence+electron+configuration PDF link annotation
    • https://trisyscom.com/userfiles/file/kepukodatawaxuvuwanuwu.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210723115520.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/58948089778.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/20892156627.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc70038475---xukuzul.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02ab680d84---8818848781.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041ae642bb---falejemaxerosut.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/40374036429.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rg2r6ctnnmofbljj17jllqsd8e/60828474406.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/napurenulureliromol.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6df842ce6---rasuvakariker.pdfIn PDF document text
    • https://irrisyst.eu/files/file/21569815692.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e1d57d1a8d112a62ce87bcd44c133802/gepinifuwamivemadojega.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/gaxozozupuwejox.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bb70058d---39105421705.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9de1449b8---vewudivimitiseb.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/pininarufigib.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2415cb30a6---44358655735.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16252664141514101839.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/15279751098.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb5bcbca45---mosopukijukak.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/353fa33290a7fbbb19cee04e1e4a2f13/30366241040.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/makuzofujujakemozipumiv.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624349367132036892.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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 17188 bytes
SHA-256: 404f9ac16abef0d94b5a576cda25c6e4dfbd7b338bf5ad1105b29089d2357bfe
font_01_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 10584 bytes
SHA-256: 259a7ecdbcb04fb8ce0751fc1c095f143eff144affa4a898de9eb6e25a64d7d3
font_02_sfnt_off00013316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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