Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52115fd0d2a6bd7…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 11:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9268a732dec6d18bd305604e685625cd SHA-1: c01075785385e3649b64ab1636c8fad5316a7ce2 SHA-256: b52115fd0d2a6bd71acf7cea18c5200e26a1589832d732f18a56f17e350e9bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The embedded links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada84865e2c---63276058199.pdf In PDF document text
    • http://bioscipublisher.com/files/upfiles/file/11434834321.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4449b5e6---rutaj.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/21211252408.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/zebifomosim.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0a9f28b518be015d3cfd612bbb31d540/44914474954.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e28d91f3460f3771fafe0de3ffa5ee41/bemizenemewo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/56574066536.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/40a464560c910ef7d318bb794f98e15a/31563158203.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/v41uqnfah1asvk2eoton28695n/25212180928.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b1ecb50acfb4946af870447f0a695de5/jadutudetulowomijexew.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/vuruvusogonetademimize.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/84140cbbb3ac5b11daf9a1c94fd3de79/54377592371.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/13411758446.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d0d943f270ae47bc8f45fed9361c1517/sijupoxe.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/gonoregetiboton.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108061159263378.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/up0cbltmd73cdajdjljka17b5q/rurufulivatulupezagopo.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/zulusamogifipopaga.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/54312483045.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/38083725574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+randomizer+rom+hack+operationidroidPDF 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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 10716 bytes
SHA-256: d381def05b1bc7db90c15344430adfa77cb799ece00ef577b36830a53ebd9848
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 19940 bytes
SHA-256: b2d285c7cad5bcb492ed21b307865b36026fd3af214bc4c2148e7841bbed1537

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