Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6585f792a28d44…

MALICIOUS

PDF

85.9 KB Created: 2021-08-24 14:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20c1e3508698659becba525fde440e1e SHA-1: 71e8fc5c3e1289c00fcc498aeb03458420ae9c49 SHA-256: ac6585f792a28d449a626ffdb64d96296037398cb9658c6d31cfd57f07c90ebc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ersatzmonitor.de/userfiles/file/doxovufo.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ab9a40394---33271418834.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/durakufizoxuvumev.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1a5935dfc98cbf22c9218cd2f28aa2aa/funaf.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/wimanujovibalalagepuve.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/bavebiwevaz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16121d98e279ec---26410327168.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/fefunekugozosugo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mugedafazekuwosabejeweve.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d75aea1a95032876b0f43398bdcc215b/nudowujeme.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b63842669---21729110462.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/16071960296.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c7710b37c---mugefinadovisog.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/92662867150.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3f53f7ac13c91cc982100d4924893022/1888041619.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a69c089f---xulugow.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/9499585132.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a672aa37502---dozevapunuterebupipa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i41t61hs5tac0ns3s6dse3ito2/49209731148.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/78941702862.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952038875ab---87223831956.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/776b65dbc6f06c9ef9ab7e050cb56fa2/38908074833.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/zudadepurarukefimozejowak.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/zativilurujumeragibag.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/923831932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=control+and+switchgearPDF 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_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16872 bytes
SHA-256: 6874aa6fc1f36dd44bfb636830a3ff352ccab8abfd6fdada678ae34b19b8dbe6
font_01_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 10764 bytes
SHA-256: 5ca523533f3b03cfa2d08b276c2fdb8f4dd962a0b5a7af4e9263ad0fa85c8303