Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5387626308abb2…

MALICIOUS

PDF

92.6 KB Created: 2021-07-06 17:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4bcc962ef407a44f85b914ea58c5c738 SHA-1: 0f0dcbd83656c3729d5a3c416e9ed2ac4e691eb1 SHA-256: cd5387626308abb207e9f227e8823faabf1865bb74175f709ec55866306de477
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm, with many links pointing to compromised WordPress sites and raw IP addresses, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9312ba40---sapudug.pdf In PDF document text
    • http://thepokewave.com/uploads/files/42574007652.pdfIn PDF document text
    • http://vtaky.sk/media/file/subudenesesoxujanef.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a256b2c5f5a919692a30b7360a3e492c/futiwutufibifiwa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a90291083---268627066.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/72968692677.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lutagisanaxubisef.pdfIn PDF document text
    • http://berbun.com/user_img/file/64439897722.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/rufonutoroben.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/95209644715.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mawajuvi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/33900aa6f0aaf4a9dc1603f9135a069b/lipekexupoverozuditir.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/24347538011.pdfIn PDF document text
    • http://splogservice.ru/content/file/77554689451.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/da48e6dd843fd4ffc8e93900bd2a7fe3/muleremuf.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eff5f11ca---42582471713.pdfPDF link annotation
    • https://turismo-galicia.es/ckfinder/userfiles/files/rotukixakejitalig.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d74e7e7ad---bujilepadumoliwivipok.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/34808581891.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6f5778ea---49801427816.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/14929642276.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/94f43d7002bebad49055a820507dcdcd/53339921193.pdfIn PDF document text
    • http://michalbaryza.pl/ckfinder/userfiles/files/vumopetipedozupusuxuzenat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=teotihuacan+pyramids+from+mexico+cityPDF 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_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 17072 bytes
SHA-256: 9c15f8aa5b58494fcb257352a24e81f592011d2b4b1ebcfc2887d3fe8127170f
font_02_sfnt_off00014b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 11120 bytes
SHA-256: f2b49a5d6a87dc8fbc1c48f4f424675ff0639bd99682996cfef488c85e1a79c0