Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77ab592042e8572…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 00:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef02a177fc171addfadb084d6779e5b SHA-1: 5661e7a9d8f6fbfb75c0f0a37402f8c5a2e059b8 SHA-256: c77ab592042e8572be4db72bafa86afe11aa1c868e349279533c77f63f7d7552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cmfnepal.org/userfiles/files/82029989789.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614253ac1b404---raragasonexofopisadixaj.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/saziba.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/rorasuxe.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/vadulipajibuten.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/28149473072.pdfIn PDF document text
    • https://kaparatt.com/images/File/lejoviriketuliridebevat.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/rikizujopu.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/79902828803.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/saxuxibobebijomevaburubi.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/datojimaxepufo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb184ddfa---21467076049.pdfIn PDF document text
    • https://timminsrenovations.ca/file/fLzp1S8exaZv1lvw.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/dajiwilafebunivegata.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujofozobuz.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/ninoxabejisutinijesanuwo.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/vibujobede.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/64055537173.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hc6q220gdodtm6n7ghctnrr5nh/tubowepavitevej.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/29468618192.pdfIn PDF document text
    • http://gibisch.org/files/files/6437618539.pdfIn PDF document text
    • https://sino-islam.com/upload/file/211532145558.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903235801552.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/gapixutazuribujuwob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+crew+2+best+drag+car+2020PDF 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_off0000afb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB5 14524 bytes
SHA-256: 95976c214b3b54b0693dab8e379463acb68aa3b2f679366af9eeda5f8add448c
font_01_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 10720 bytes
SHA-256: 2d58b459ce91f4de87f72770e20b8b22d60a05118d513b8cb2b6b4e0d3f50cb5