Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35629ddee1d6fd5…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 14:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdef83ed4aec984dc8ed0037ba1b9683 SHA-1: 991557f50ccb9f16543e963c1f7e46d31f62997e SHA-256: e35629ddee1d6fd500e64ea76b48086c0539b79b6406ae7feca57a87a3b993c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it is designed to redirect users to potentially harmful content. While no scripts were extracted, the presence of numerous URLs pointing to compromised domains strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074db66d4098---39023099213.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/32e63a87882cdc950bc2aa1d62f1efe1/12573977713.pdf
    • http://agataklimowska.pl/userfiles/file/zufujarusugazuwiwikon.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b35a31b3---91131817389.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f4cc2e9e3a41044c036c3f2218679f97/magaxo.pdf
    • https://liniagdanskzydowo.pl/files/ruvejatuludevikogake.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/22816700.pdf
    • https://termocasasrl.com/file/12216661917.pdf
    • https://btegypt.comfile/sinugo.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/29458247415.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/76330710872.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d7515d43---gomidikopimomu.pdf
    • http://lesmashclub.com/imgUpload/files/zodinurulaf.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/16810985531.pdf
    • https://atraba-holding.com/userfiles/file/gokukokolid.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0cb4f18a52a9c03e2ff32ffa6a0d6014/50833979795.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/af1075bdcb6a77dc5716349dcb5c3f15/4080926902.pdf
    • https://haidangpc.com/contents/files/rorikusujuve.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cb913a810e110e062a433dfea92728af/65271153628.pdf
    • http://vietthanhstone.com/images/news/file/jojazogizuvulu.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b47ce58f---4645062533.pdf
    • http://www.cafeinca.com/img/public/contenido/file/bovotibizuj.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/208602114760e561cb0acae.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c43550a79f9a11b710ab238a95b479f7/guraruz.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd013bc1b59---70683639348.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/22517250765.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=informatica+powercenter+10+architecture+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_off0000f6b5.bin
539d8343d45e684e2048248bbcfdddfea89742feae8cd69da028dd80dff734b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10984 bytes
font_01_sfnt_off00011012.bin
f325b7a0f30d2f12fd231a88697ca689006d88b3f00e79e5cb44ce63da4e817b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 19480 bytes
font_02_sfnt_off00014171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16792 bytes