Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf0866e85ebf26c…

MALICIOUS

PDF

103.6 KB Created: 2021-07-09 00:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48c4dc95cd2143565cc79414c7db3a99 SHA-1: 89fa0b8e41af6f7d421344df5f973d13211e6fb6 SHA-256: 3cf0866e85ebf26c4ea067e48d278588083fdaff540811dfb98bd93dd65f8e59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the heuristic firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ec70e495---lupozelurutexabiji.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/nabala.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804411d74e2---bifuzavokukipanelimefikup.pdf
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/mekojiritogixojebike.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b98364b0472---kunidoderiturelukisegofas.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830b5c4a8c---vusowepomaposo.pdf
    • http://barudan.hk/UploadFile/file/20210628134602385.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q6unethpalkbn1k1mca6jgeja3/63658723160.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/wekonenobitefivobapusuga.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e34a5f2e3c79366175a6846684d7033e/47042174167.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b998f202---12450136014.pdf
    • http://allasclub.com/campannas/file/luvaf.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9e7c443f---11758835787.pdf
    • http://china-zub.ru/userfiles/file/57829922832.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/82681588383.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f608d5306---nenutonirajekowabi.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0kqbqscl346oagcsf0g3fk7qg6/jezasawavarose.pdf
    • http://goref.ru/files/file/bulipafojorutobidape.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4pi6c19nch1ra6fhk5fhfqdt7e/negutinigipadukapebuk.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/280epj4kks84hlb3g78f65gbau/9769381784.pdf
    • http://hotelstrack.com/bot/ckfinder/uf/files/86243637597.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9454f0e9---pukakifavasegipujuronatuv.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8100c5a9a---10149663276.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t10lcbff5fpoe77uoqbuak3o1n/sawetijugegovezife.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=advil+and+amitriptyline
    • 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_off000131d6.bin
d46ccca3a6b318f359d743f0bf78b8f5590602d227adce05188ee5adb9524951
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 18840 bytes
font_01_sfnt_off000162ef.bin
eb062f61ed57fcf30603d7105b72b540dac42ad31d1aadf54d47715b0532fe6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x162EF 10424 bytes
font_02_sfnt_off00017a85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A85 16792 bytes