Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d9a4bda39828cd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 08:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60aa04145c2b3bbec31683c1e0c1b219 SHA-1: dde2e013c25dd75d8d679cca5b64b7bfc2867288 SHA-256: e1d9a4bda39828cd89b5bd3bb43a27563f9aabdbe8b00a680f137543acd111ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://dalnoboy.net/data/filestorage/upload/files/safivuve.pdf In PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/98918742291.pdfIn PDF document text
    • https://invest.pl/userfiles/file/28446862144.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/22943671711.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b2ddd3b9---dotilikov.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/28144741649.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/denogugopabijabaj.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/putuzenibobulaguxivum.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/mexufalijokavumativujadon.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c777e20c2---98433038963.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/geluzoxatabopibolux.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/29422753560554603a68d3d0ca05e1ad/62668779767.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/gasimumotupuw.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/parelowim.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/79193461374.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/28254666504.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tidemugokenujapebavi.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/xenoletexulu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/titunujabawafu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/benusufefapaliw.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/bujususugefazobavakafiji.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/lebizadepigedogosatupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+booyah+day+download+for+androidPDF 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 10504 bytes
SHA-256: dd96eaebc2a236c864c817a82339bf5f353a70d4995f0d534162da4ddb9f2523
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 17708 bytes
SHA-256: 217e7ca4dd39252fbb10082947a4cf6e728bdcfdac90ffb122d0f2f844a483f1
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1