Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cc2a8fcb0e5987…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 05:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf3b4a57cf0c53f5256370b4ca46cb80 SHA-1: b443b5e18d4b135098ffd73273d207c109f35862 SHA-256: f9cc2a8fcb0e5987c3c0e9ec51d69d62bd822fce56a1642c57349f9e3b6cb013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rockyhotelsgroup.com/uploaded/files/mimozo.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e715a08af---43461232558.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/2323487640.pdfIn PDF document text
    • https://togeltop.net/contents/files/gemat.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/pitura.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/45679666270.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131f507b9665---posowudepevaduwulibiv.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/53679737262.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/67470088927.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f1fqmt1cg2ht7tqgvjb5hc2ugs/80995001872.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/33317553199.pdfIn PDF document text
    • http://www.agot.pl/upload/file/21604445516.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/10759070505.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/80159292721.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210912_1A41DBAF88EDC023.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/19604976156.pdfIn PDF document text
    • http://offerparts.com/upload/files/lubasonunorerivexebakoru.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/jumukuli.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/57186217923.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56755875974.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3g4dm9juemmknjroqbrenoroh3/47770732208.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613060c69c306---53032014854.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/pezika.pdfIn PDF document text
    • http://isgsrl.it/images/file/bedufabisuxibuvuvef.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/99338924622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ldplayer+download+2021PDF 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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 17972 bytes
SHA-256: bce749839452b20784577901bb5ce422b4277774a96d2ff4d3fc54aba8d4f02a
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 10480 bytes
SHA-256: ddcfb130e04d949e91fe48b55698817851965fc878a5f6d517bafaa17c3d67c1