Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51c28f7620d9beb…

MALICIOUS

PDF

114.6 KB Created: 2021-06-26 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c66b2121f82bc0300a462aad205ff3 SHA-1: 2fdbfb0bc1e535d39e909d72f95b7fea35e0fa7d SHA-256: d51c28f7620d9beb6cf5575a35d778ebc24a0617b5628bc4da876297f143be3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly suggests a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=hypnosis+for+self+love
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6234842702---tudikujonimenuxolipijo.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b27e274fd3beb913fd4ab02564a566a7/72550529932.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/84107168752.pdf
    • http://nutranghongngoc.com/media/ftp/file/tujuji.pdf
    • http://slanfusa.org/clients/47225/File/66789699057.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b13146c6---latiruwex.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f144550c44629c84b0ff9ec1a1da969f/wopasujimuwewa.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/xavigu.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a7fd35ed6d0bd21c5c57eaa16e3a7cd6/24986716932.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cij8tdfl50cldu5bke2pfr1h7o/tanipalavetav.pdf
    • http://tz5168.com/uploadfile/image/2021/05/20/file/20210520_202231_117.pdf
    • http://flagrant-desir.com/userfiles/file/33042441233.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/302bdec85716efea957c2cfaeeaedf71/60844093476.pdf
    • http://vasvaripalmuzeum.hu/upload/file/dilofikagufoberujaka.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fe005146---gojipajomiliveziwumowod.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/175ce2ed67b657de6b36a7caf7fc70d0/34293455048.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6c70c0423478eed1d515c94c1cd6bc6e/67497713386.pdf
    • https://beautyyaurient.com/editor_upload/file/xewosuxoruxodifaramibare.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6ef105938a02b3e653aa1c08b879a08e/magelarusixeja.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcd675de5---risarojejijidus.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/52107111900.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160853a8fa69cb---24378024893.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bkobevbii4diqbqol8va6iptpi/34859884993.pdf
    • 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_off00015d22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D22 16792 bytes
font_01_sfnt_off00017534.bin
bec1889835c6c6083564cf58bd1ffaf11c76e8cb64de19ad7c7c0f2318667581
pdf-font-stream PDF embedded font (sfnt) at offset 0x17534 19724 bytes
font_02_sfnt_off0001a5fd.bin
7f9636b4b355c90c91ea636b622ee9c357c8796ff7dbf3f79ffaea7862560218
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5FD 10264 bytes