Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcc69534a0b142c…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 00:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 044324cdbf3a4bdc759e92f45438948d SHA-1: 242b976284d14501a877e2e45f4b71b9d05b26a5 SHA-256: abcc69534a0b142cb57f1443f4144770ec16b4aaecf6a173a91d69776896494d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or further stages of an attack. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e3552ddc---numuzobadidoduxid.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c4a6fef35c6fa5e452b62be967e25dde/39677716925.pdf
    • http://skolicka.eu/foto/images/file/gudixazek.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3ccb9a63408a5df06eb2a8c225177923/faviworuderoxojixe.pdf
    • https://psychologgia.pl/Upload/file/dapagofa.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vquf4sohil2absmamcdlnqqku8/41453055983.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s38pje6p6o5gjtcbcgloqblvap/6624466501.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d699a85e4e6465e0a69f25d3529e2980/dukidofamadewibazonu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e659670bf---28982163122.pdf
    • https://angkorphotographyguide.com/userfiles/file/regozawo.pdf
    • http://madmojo.com/fckupload/file/47645840420.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/241af4862109d7052e9c648adba5af3c/miwikufuno.pdf
    • http://harchovyk.com/userfiles/file/loboxulewusisadel.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/38bf95149cbbd38179b673364d3661be/kazepevemitipevo.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877da873f36---potiwamadori.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072b815363ed---26323456165.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609855452fef8---60987231296.pdf
    • http://bakoca.hu/files/file/mixemarufido.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/701cac32965a3e0bfeb388d3e8665c70/83007631184.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/abf35ffce8a92728b7e9f3d2738f8c05/97291241694.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b4bc5480b---36096248707.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160837129c4d6b---verowuf.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/lebofokevujigag.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ffe9a1b5---81281984469.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=9.3+assessment+biology+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d778.bin
b54dbf994a1c96b004dc19ab621be1695337650db5eb2645b8ab6b266c7e43c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 16072 bytes
font_01_sfnt_off0001010c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 16792 bytes
font_02_sfnt_off00011923.bin
3fee62585546af00cc738cbdfe1d05b5531f19dfd5248dc90a8a7ebfc6843409
pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 11100 bytes