Malicious PDF — malware analysis report

Static analysis result for SHA-256 80aaea3b0de5be10…

MALICIOUS

PDF

89.8 KB Created: 2021-09-20 23:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f0405c924ad97002f3b3b397171ac26 SHA-1: 6f017a4b3072522701dad28053cb86c0359958b2 SHA-256: 80aaea3b0de5be10e5fcbc9c8b1ca1155a7ffd28406e099f6a96167777e08b00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, including compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://laborke.ru/uplcv?utm_term=apk+minecraft+pocket+edition+apk PDF link annotation
    • https://tyeetomsfishing.com/userfiles/file/bizofedenu.pdfIn PDF document text
    • http://shahgrp.com/uploads/jonajazakifirisudifota.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/kitowim.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/38997152430.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/59270747381.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gemiravotubaxuniniwonezu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ff6192e5---budaxuwafi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6e936f0a---81541432912.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/fajefevatimafuneza.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/mimijozinazoliwulutegif.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/84821930245.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/65852631685.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/sakomepek.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/73900242599.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/dumosovivepebakumojuxotof.pdfIn PDF document text
    • https://noddy.nu/images/file/1415011400.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/9236226883.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/37675332482.pdfIn PDF document text
    • http://identik.hu/editor_up/60554817896.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/fatud.pdfIn PDF document text
    • https://fuoriscena.eu/file/xesizelebozogixe.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/robamepobudepupazuwiw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba811235c7---51332223627.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/9458437583.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613647a7e9585---dufamupapi.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/bogomesitenora.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bulemagazupegurupa.pdfIn PDF document text
    • 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_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 10640 bytes
SHA-256: 8bb99912216c0e8708931ea8dca17ef054093e4885657278e8c87a1b2091146f
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 19000 bytes
SHA-256: d51d28f702e9f41a327219e68e482eb0fe2701fda3d4b27693be5cfe74f859f2