Malicious PDF — malware analysis report

Static analysis result for SHA-256 71000a8f15b7cf81…

MALICIOUS

PDF

87.8 KB Created: 2021-07-05 06:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a4f364e622dcadd1d7c410b06373439 SHA-1: 1cf1f4f3fd71664322681592e93aa71715693f65 SHA-256: 71000a8f15b7cf812988d2a6c5660574fc68ac73d4beef8680821136dd4ccc20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cukiernia-waltar.pl/qcms/userfiles/file/xifebexijulavop.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750c3d178e---xugizurodem.pdf
    • http://dongxuyen.org/upload/files/96628741138.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d219dfc09fb---48837877338.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gtt13hv8khaquqjh0fgoho1dj6/wibipazojedusifapukuti.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a801936bd---paxiluvidojimid.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fatavaruvewapotodamale.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k7cmtkphhbbck9u51g3n65qqf5/wuwipub.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd157cb3d7---41776359734.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609091563491a---63099328727.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/37650273563.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0384b45589---jolopani.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/r34d0mb25m8590otunl9rkter5/wuvezefivezixi.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bf04b58c9a9---46706096618.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da83327e9---97918898329.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h1ib5ntuht0a9plo87sp0lt6i9/72236669977.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d3ded61ca8e9324ccb4f62666fdd1c54/lopefoxodavakugutazire.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393ca0e490---jurajalopaji.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a707984275df1d83e63560891281264b/kizilubewaxukojujikukus.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/252036155893.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8beae47315d7052b35d602735658d481/27030302521.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/56823765431.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=summarize+three+factors+that+affect+the+melting+of+rock
    • 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_off0000f065.bin
ef1c04a07139dcfe5d7b114f70418c7b67a849dc78b424b639a3ed37e5f508df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11112 bytes
font_01_sfnt_off00010a30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes
font_02_sfnt_off00012242.bin
43ed5dbc83f03cf8d94c9be2bffa115ac9812d93724950286d29ca2f8d184d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 17396 bytes

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