Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c9072363fa2676…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 12:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b013f67c43962047e394f606892865d7 SHA-1: bab2e460646366dcc68b322d6f89596a3ecda936 SHA-256: e7c9072363fa267669b80ef8b7513798bb075e9a12eb6c500fbbf42d49b0293e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://decoworld.in/dayafter/uploadimages/newsimages/file/6361104069.pdf In PDF document text
    • https://hoakhanh.vn/uploads/image/files/moteletuwabikamub.pdfIn PDF document text
    • http://reylab.com/userfiles/file/26216937967.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/nutexamanofom.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/6644530135.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399cace69ac---78114218680.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/lixumopikapofafij.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e488681b9---98934010498.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/98731749244.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/80807362864.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d30778e90---jiwawebejuwamopobi.pdfIn PDF document text
    • http://sissonne.hu/editor_up/supokiwud.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8bb2f1fc3f01962d1602affb1cc8caa0/56786663845.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddd97c64a---lesisizoteluvek.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vanixuluki.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/mebadajakemoxepibowe.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/44463688183.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vusuregudagaxeradil.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/14507027380.pdfIn PDF document text
    • http://xfswchem.com/upload/files/76178687135.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ece29c6f86846fa59ab78335bce9ae61/50265010637.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/nafesutezerezewetumasose.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/53459474228.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/38485821729.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/52983308251.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/widemakinibafafagepuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=1000+phrasal+verbs+pdfPDF 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_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10464 bytes
SHA-256: ba530d62ab5d4d7f2885bd41315b3b46908a35a26b26303eb602ca42f622f93d
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 18568 bytes
SHA-256: c9593b2b7814f7adb29735ed551d6de55470e250a685a6cbe220ec2c5038f8cc

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