Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbf196cbddeb602…

MALICIOUS

PDF

80.2 KB Created: 2021-06-17 16:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025350a1f22f35ef3d5452f112a31795 SHA-1: 4168f84a63cf2a2bb5c2a56b8d9202429962a5a1 SHA-256: 8dbf196cbddeb6022501236b93de70db36169a71d0b2dacf1dcc03f73a7b094b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae347d46e---9372099699.pdf
    • https://scavilecis.it/userfiles/file/42269141389.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077557e9c75e---fasus.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d2e7afbf---zowejinexozabubunovawu.pdf
    • http://shinies.ru/img/lib/file/zozimebomexidowilodibud.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e625521e355879e57d1c5bf81690c45f/12264809707.pdf
    • https://permargi.com/files/galeria/files/meluriwuxijopanafelidaxob.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6abfe3868---vabirisivavamefiwudarorum.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad021839f41---woxomogibirokonetodep.pdf
    • http://blevy.com/ckfinder/userfiles/files/jomopatibaxasonezaloxav.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608da17b1f358---tinesed.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8a813f73fead7dfa6cde11f7a822c83d/dibazixisejuporevu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mgrn1vgji55ghb11aecdv609v3/nutuxixuwedotaxugepab.pdf
    • http://i-daa-wl.de/userfiles/bekibaruto.pdf
    • https://soechi.net/userfiles/file/88359149990.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/11e04b94d906e4813bccb5ff6234d0b6/85543454403.pdf
    • http://diysmart.net/userfiles/file/73970786987.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2nd+standard+evs+book+english+medium
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f4b3.bin
1806b17ba68e2544d50981832e3143b2858563b9384835d9ec91107c3d7b8d7d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF4B3 8448 bytes
font_00_sfnt_off0000e204.bin
ad8a67b3531653e9aa37fbd1f932b4d030099676ed39287ccce4237b142033e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 5540 bytes
font_02_sfnt_off00010d18.bin
a82a60f7d46a4c2f5d4da0926f05383a39be7d629c221cde5580ffc1b9f26d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 11492 bytes

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