Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c490c97751f2f…

MALICIOUS

PDF

78.0 KB Created: 2021-06-29 00:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2a1c3a6991587a46539df3961ea83d0 SHA-1: 0bb231658fb9dd48659e97ff58343aad569aa54c SHA-256: da6c490c97751f2f5dbfac4bbf6702d66d9a18866639269460e0e3bfcbc3c99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely designed to redirect users to phishing pages or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=put+a+keep+are+you
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d66dc78c3---88366642288.pdf
    • https://tangentemag.com/img/file/74117813929.pdf
    • http://usaoxin.com/userfiles/2021-5/file/83622931771.pdf
    • https://latework.cz/soubory/77263906461.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/gulemasijos.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc69e3f94---gopewaselefejapijopeju.pdf
    • https://autosaloncenter.com/uploads/file/gidajeguwelomidufetizom.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871319928d8---lowidaruvigabote.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/438c66d464ec62be024bca73b34d37f6/wunorotodixikorus.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/89276512868.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991cf606304---34878644781.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/500b77b4d43c029ec65040d5c42d036f/mopavesizet.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4e190ab3969ca2794adda2929bf8b79f/3706004460.pdf
    • http://growlink.biz/userfiles/file/wifafeturowoz.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/obdnauegkne4jkq52gikivh6tp/zokusuramudit.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a45c42a707673c39d1e962c992f2af1c/97200349843.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c387fbdcf78---tulanipodaxidenugep.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb312e26ee---80001225897.pdf
    • http://globeksa.com/ckfinder/userfiles/files/powemezedugoxutavidamabef.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/if058mrnvfi3gebb2mscorqpv2/49862472189.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091890389b60---28910985913.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9a5eae3a---67260835751.pdf
    • http://dajuicebarus.com/uploads/files/ramoduluzanev.pdf
    • http://citra.cl/userfiles/file/tifikobavogetera.pdf
    • 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_off0000c6c6.bin
a54600fc11341f85b30d4d0b1f239b4bc5b88e052e1c0f364b88741c513aabf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 21308 bytes
font_01_sfnt_off0000fac3.bin
d1f41d6d9eca6aa08b248f0d2eef7a5100dd82376564736f842c4100bb257abf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10144 bytes
font_02_sfnt_off000111a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16792 bytes