Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aeb3c0597005a99…

MALICIOUS

PDF

83.6 KB Created: 2021-08-30 16:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9806a3574a939feb49e00a5e2aa37c3c SHA-1: 7fbcd419072da79628074b95553909426336264b SHA-256: 2aeb3c0597005a992ae1d9bf22cf9e3774d68f5b552533e444c45c69ec2b1b94
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not contain exploitable content within the document body itself, which appears to be malformed or truncated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161150bbdeb1fe---44147086325.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e300d63---segijalugukofajajejan.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/230b8f386f5835aee2a61571f413acbc/guripipowudibizepubuxu.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/26e57641c983a5179f4068c3260671be/panufewudinaw.pdf
    • https://sce.tw/uploads/files/6107decbc6357.pdf
    • https://adian.eus/files/galeria/files/19876158601.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3aec55115---16342619832.pdf
    • http://veganogle.es/uploads/ckfinder/files/61730764797.pdf
    • http://cipetbhopal.com/webimg/files/67674646371.pdf
    • https://adikketiga.com/contents//files/87546166132.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fd4ef3078---mapalupibumugo.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/07846a30ac837027324a6e80ab2fdca0/90615325138.pdf
    • http://dashoernerboot.de/userfiles/xikufeduwu.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/17eebf0f6fdad57ad79a2168525f5a36/nadavasakufupotatulibum.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/26a71b7c91f4d823404b2ea6556f2a1c/ketovo.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16092e8d19c41f---tekavisebifin.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a2992cc5---benimoxim.pdf
    • http://electriccityusa.com/images/fck_uploads/file/naxiloxuninosalukix.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8c31b45e05708c1d4e803dab62dfb5b8/wibewukova.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/461b04432a505d8d851abed6d7d77277/82269061164.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbd54287dd---9533949286.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f89c7e52101dc7d8c7d77412bb6a7ce/sigedovimezemigofosu.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/25859997990.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4bsgr7qoehl7hcf40j39r98lo0/94106834778.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=after+stent+care
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbae.bin
20c3bfd96896c4e1be240952733a7b2e9e16756f5cf6e737abeba2ceb4d7b59c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10052 bytes
font_01_sfnt_off0000f238.bin
1c4307ab87ac527b06f7b70f45809906d7ce9861ce0a2c3764d31aa77935b8e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 17196 bytes
font_02_sfnt_off00011ed5.bin
7be29d029cc9edd1ca65214835b7df57e29855e267137a0e9c654e8bd32ff9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 1936 bytes
font_03_sfnt_off000127dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes