Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ef6f2ce4123aa4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 09:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f9ec1217ddb08ac58758eab4c8479db SHA-1: dc5c9404a0f7b7864d88188ff0a15195d5e714d0 SHA-256: c3ef6f2ce4123aa4d99c5c3cc72a608edf79a76c56ae95a1aa054d6bd8b48499
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nomylo.ru/uplcv?utm_term=reticulo+endoplasmatico+pdf PDF link annotation
    • http://bacsionline.net/userfiles/file/41109160157.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a41cce6bf5b295c408f1322b8e6d6455/99080336614.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ab0c586f5091ba89a803134ead06f5d0/86786945962.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/83236151813.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c981b9146a3---nojupulisabesivo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/xigawigekafovoxifaf.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/da06c319ecdb1b61ac8eaa921d4e2258/73366190781.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/vuxekuzexavofamiwujopufu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12268826957.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6b1db4222e3fdf9b61a164902ced2f7f/lewatasebitimikaminotuxa.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210607_59A7BF398CFF363E.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9ehm7b69asuq8uq1i2p1gec22h/82690828033.pdfIn PDF document text
    • https://ovalpolycoats.com/media/wozubetezasatonujugutor.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobujumon.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/66301510402.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/3814379874.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8253c0fc0ea89059d1484f559a0fee1/98968127627.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc9dd66b---24336845476.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125aed4e5846---89696786696.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/ditezanidupujerajeduguk.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/99276821753.pdfIn PDF document text
    • http://flexicourse.cz/res/file/29476252362.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/pezanibinizunosikurowi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b916472a17b---gamukokolekomadewonivifo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6e6c237fd21e609dc4a61674eba46cdb/14438795349.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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 10824 bytes
SHA-256: 5db153da055f4e60bfb71bed9089ea014440b237b4b970f1c39b4ad8765263b5
font_01_sfnt_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 15708 bytes
SHA-256: c63dca881a7a4d6c5a2559461692e3bc5f9ab75f0b01bb38036fe01821f44806

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