Malicious PDF — malware analysis report

Static analysis result for SHA-256 9599d805086a8353…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 09:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca4456caec45848a17f16e1529e821ea SHA-1: 8eecebbadd62f8b1fdbab33dd365bac2e59b97b7 SHA-256: 9599d805086a8353fa40b78dbe80b1975de1adf98a53d568fed08dd7206c8550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and link farm indicators suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://safarang.com/basefile/files/17206722161.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/kawenimewonorefukus.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/863bac45b090a5854219ef1cdb49a820/mawugus.pdf
    • http://kompassztuki.pl/Image/files/21795443962.pdf
    • https://wojczak.pl/userfiles/file/ramuxapajaparumexubamumi.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/76632897663.pdf
    • http://ahrestygz.com/userfiles/files/20210901_052938.pdf
    • http://pasted-radio.de/web/files/60401593467.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/suvidokudapo.pdf
    • http://maxbrio.kr/files/files/59383597702.pdf
    • http://asesorgubernamental.com/images/file/nakopevana.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/fq9tse7ti1hlh2k666tj4m0ovm/jifajijawagigoja.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2c0c08e2402532ad6c7c4e24c38930e7/22846662969.pdf
    • http://swotaweb.com/img/upload/file/8223796164.pdf
    • https://ketdoanbus.com/webroot/img/files/zakigipafavinetuwuralaga.pdf
    • http://phongkhamthienhoa.vn/images/files/34120231990.pdf
    • http://caratow.nl/userfiles/file/14076144002.pdf
    • https://flyags.com/editorResources/file///rogemis.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/73758602008.pdf
    • http://qdsenfeng.com/data/files/pazibekusu.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021090405502273499.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/84143297050.pdf
    • https://didaktika.drmix.cz/uploads/files/76630775569.pdf
    • http://apart1day.ru/file/54075207726.pdf
    • https://speakingparrot.com/upload/ckfinder/files/mofagebupisab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=play+store+not+updating+itself
    • 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_off0000bd6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6B 16792 bytes
font_01_sfnt_off0000d57d.bin
021fd394aea33a550f032179079bc85836c3700cc91d9d36f0430751b6cc2289
pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 16564 bytes
font_02_sfnt_off0000fff3.bin
99c1684c24917b9450708c480161cb9bcd76db600442df29d41025d3c8b6ad92
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10888 bytes