Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3245e0c66f3062…

MALICIOUS

PDF

78.2 KB Created: 2021-08-09 07:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5eefaa417ba59e6b5a23ab12c338dec8 SHA-1: ec2d854ab9846cfd16884352a8563bbca4b1e18f SHA-256: aa3245e0c66f3062e1a5b06e399a8b1358df0b476f234dbd59d0ed6752537060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc557068043---54190768301.pdf In PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210505040429.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/nizuwiguxegalujidi.pdfIn PDF document text
    • http://rideco.hu/upload/file/resadurefovimujemavujazo.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/30649741956.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/31969e191cbd01d54774996a2342e34d/farotalemikevubota.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/6951819482.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608596302d0bf---kuwej.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2749069c76---giratijevili.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/kevamos.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29a029b66c339eb3411fea7dcc3e08c/nipamobamogoviwumotisur.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8vfj3futih8dv9u7bgmrr821r1/muxoraga.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dutumemidikasukujifosup.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d738620f3d4---jiwugaxibufesenepagejiwo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e53f425c422d740bf5968841d8d848f/15745961824.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/j7natc0e45vaj2oc8hddngosi1/wujakorufevajani.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dobozopolofunosufafuw.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/26394387401.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9aac83ca---93350200989.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/walodafiv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608828ff9888b---gudugatotewozuvokibetigil.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c43023fa2---25049075292.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/tanifepavoz.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071410293773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prioritization+delegation+and+assignment+pdfPDF 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_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 17720 bytes
SHA-256: 6f72a8809d4dd15c128de4f6c31bcb6263df3de1c7d608ef21736334e4782241
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10904 bytes
SHA-256: ada9d434a5fd551530aa0c6fd9ca777b0abb53d13be9608d2b0a3ae57715eb70

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