Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e7335b88ce1c06…

MALICIOUS

PDF

93.7 KB Created: 2021-07-24 05:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5ee1205c8afcef08e37508d98712033 SHA-1: a7dacd0af7a41028c9b9c04d7e61733550fce60c SHA-256: 26e7335b88ce1c066efca271cf768fc0bae5bab94d38dd5cdf2a9891f546c6ef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of a callback lure heuristic further supports the phishing nature of the document, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hanhthien.net/uploads/file/webinasugufexub.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3220c03dee---53406927852.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9f846899---jebuvebumerodefuximupudaf.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/wokididitaxezibufelafugo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2158deca---11110623364.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nipipip.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/1380602598.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ba20474b---falusenogelonevidozin.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/lumexaxererufip.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084a477e2f92---votamumofixabizigoledo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/besekajinufefodilejuwurof.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qtglntsinp7su4ga5t36kb2df7/gevonapizapufitotis.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/sujimizizawefuvurefiboni.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/61f510a2c081e4ef8f08c7e612f8107a/kozobasuralatetutosu.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/43162046952.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/s4cj39bhtspgj8cjdr8fpuisu3/81101805703.pdfIn PDF document text
    • http://yejida.com/userfiles/file/koroz.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/giwijofiri.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/ledokixot.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/24690417598.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/2343854366.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4b21c800e4e6ed33fafdf9e20edf2c43/mejusenonazizorakadatufo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f5f2cae3---70820723460.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/88099422062.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf1250d45---14259387539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+a+free+hbo+accountPDF 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_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 18460 bytes
SHA-256: 3fe20f5f75f8dfc76d433854bf756ba5ea6e0e016d362bc2294e3230b8020d54
font_01_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF5 10704 bytes
SHA-256: d658d16257f68e7800cb55d57c7bd0a9a4f6dd42f3095f3787b2d49efcdaa8f2

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