Malicious PDF — malware analysis report

Static analysis result for SHA-256 7740a7f975910019…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 03:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fcb866694098f95816e69972f05dd7a SHA-1: c85de12ffbe89f5f129fcc8f06b17620e96614d1 SHA-256: 7740a7f97591001945221446d7eb9fcbf7225ae7aa7f375495a02eaad5e2a354
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ecd2dc174---7983247034.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0039ff14b98ff89805dec29645ca7cd0/tazawuvokat.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d3eb9bfa---zutiterun.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/tizegolen.pdf
    • https://eliteplacementagency.com/uploads/files/62445218205.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/ligixosig.pdf
    • http://osteriadelcampanile.com/userfiles/files/fawugo.pdf
    • https://happycondo.leaddeehub.com/userfiles/files/80733120711.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/3415796121.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/33ada7a652c846552a325322bb7009f2/timud.pdf
    • http://sanmorales.es/userfiles/files/migoxunumokekowut.pdf
    • https://blueparadise.pl/userfiles/file/27262791313.pdf
    • http://wingmanplanningdemo.com/userfiles/files/65068136102.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d00ef7fd9547e556b54948b4b1a32f0b/nuzevazum.pdf
    • https://siahotel.com/userfiles/files/37144317626.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160861dc3976f4---44846398356.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087429da901f---buxakexalatotanonape.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/kajilo.pdf
    • https://ascinfratech.com/clientprojects/trading/file/geloritax.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27950f20e6---34905441346.pdf
    • https://aawyx.com/sites/default/imageuser/file/85449336128.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/519fc1963288100a559cc77745ed3bee/zadutotezipomufiri.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/87380602694.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1185f03c58---mepifedesugajib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=badger+insinkerator+user+manual
    • 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_off0000c24b.bin
8f1f5ec155cfec24ffbc67eb0d0df9c0e3947d044916926217b11d3da8cbb85d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 10836 bytes
font_01_sfnt_off0000db14.bin
7166d567f6ab8e13f5f92c5b11a3df2d5fa01916460ac3cda71efbe907459750
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 17116 bytes
font_02_sfnt_off00010758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 16792 bytes