Malicious PDF — malware analysis report

Static analysis result for SHA-256 a566b2ad68d61227…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 13:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90d6d159d0505c48b58a4ac98e49fda8 SHA-1: ddeb64d3275410fcd480e6541bb36ddad6c5ad3e SHA-256: a566b2ad68d612275ec9fda064443e1ca3522c1c7a374b95974e59ed662a76c4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host further PDF documents. This structure is indicative of a phishing or malware distribution campaign, leveraging compromised CMS uploads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/piqthi3mmeakq79t8j75gegml4/zatome.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0347fd85ea---38829406671.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c727b73496---89367719609.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/s3j6o5cc105b3e4chmvde1gf73/bememisukakunekulanakemuj.pdf
    • http://stomerijindex.nl/images/uploads/ximavikosokepo.pdf
    • http://ipceurope.eu/assets/file/vujidejofi.pdf
    • http://www.jindatunnel.com/up_files/file/24955201752.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160714f70be43b---69383332848.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a686516e126---jemaxonizewefo.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lprskaarvnjbhfahslvijva560/rukutajewetuxo.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7532c71a8c9ee5167b7c8323a311dc64/54063025501.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6285477fd---14469594893.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4097ae086---xidededojirusil.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2n131cmmod2sov1r1u8u6qfrcq/8151129334.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f93c6ff4f5ea4b750156e66378acdcf9/xenegobotilojakupob.pdf
    • https://ascinfratech.com/clientprojects/trading/file/89223846113.pdf
    • http://archerelectricsupply.com/userfiles/file/jokokuzezelakixuxi.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/50421abb0c7dc51a06c5a26ef7bc26c7/somidurosijilagowo.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a0b0fc8b695a6fd470a517a4e7248cf8/nosetobenewiwosero.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a809e05ec3d---53105644547.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273b2aa024---jigixurorirekifidunakager.pdf
    • https://abe-rdc.com/userfiles/file/fisowikufufuni.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63234d61b435eb7b143bafd77a5e7b82/28113427773.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bad599861f7---kotokuki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=transformers+war+for+cybertron+2021
    • 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_off0000ed26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 16792 bytes
font_01_sfnt_off00010533.bin
9897dd71b981df9e257d2d2cad94e774ca2a57d11d8947cd4674ea4dfeb36dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 2520 bytes
font_02_sfnt_off00010ff8.bin
45ecf37c1611cb007adae70803fdb73d35aa2621cfd3bc395364bb436471c5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 17852 bytes
font_03_sfnt_off00013ee1.bin
cc654230a08cc5f0dece248329ed3109213436f962f29ff6b42750bd7826c133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 10956 bytes

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