Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60b9500ef6568d1…

MALICIOUS

PDF

83.8 KB Created: 2021-08-12 07:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 279b30fb4b90e7cc37f9154b379d19f6 SHA-1: c3cc4ff43927f657d8f65360a96523d4720c5933 SHA-256: a60b9500ef6568d19cc55e875d62a3aeb8a77f9e753f7170e6d95310d63b014d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The PDF's structure and embedded URLs suggest it's part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc3184c49---simunijulemazopabusagaj.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9596c974---2469460450.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b09f3e4b17d4d14bb78c79479b1efd0c/48474933479.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d202668e5---xejiduvuvosavudog.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b71a5eb0a8---tugalamawaxeja.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/80429790065.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4aa8feeb4499e5f2d6a655a02610aa02/gaxuvevota.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/mixazolomar.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/xajitetiliwobipemufarefa.pdfIn PDF document text
    • http://emeat.ru/var/files/jodapegaruzuvakibuz.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/vomevudadovegorogef.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/40347361396.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/genifogagafarakarifu.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/45409141398.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/87364628783.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922714914b0---jifabazarut.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/65130830891.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/91223899114.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3c807ad1889e051fda7bd0d49957e55a/rexolajoreb.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7a209b0feb96c5c951c15918ebce2790/94706123180.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d872e36d4a---74489801586.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/bewemek.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/taneked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+organisational+structure+in+healthcarePDF 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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16792 bytes
SHA-256: f53da19a7db67fe4c9a6b4146b502d853d3ff5cf4af101c79b3b4b39901be02b
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 10604 bytes
SHA-256: f31b308148dec39ae35fdb3517dc7d6d5809bb391b381666677adb3107988f7f

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