Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d298941adc4c2e0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 00:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9930c53cf73f49e9905743da1d209e16 SHA-1: 7edb9e3959321eb348c5ea8258f61985bfe99593 SHA-256: 1d298941adc4c2e04eecebe5959bea7d959678bd1b0b20c223e845df458d3a1b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, directing users to compromised WordPress uploads and other disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://veterani-pushkino.ru/userfiles/files/vegawibosejezasusiz.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a4a6453a4f15e6b15f8142b84142228a/30509323334.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/8207775501.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5f1f4b5f07109a64667134ede1c9c776/2907507026.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/30571233148.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/87152410495.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7d4b779e5c9882dc914743598cc06492/5872576413.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2156c427e---92591545274.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/urh78qbv5sf9fplkmrs6o2guv5/rufivipuzaradigepegizo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5ecefc42---subosusewanoxula.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb47ceb73df---noxivebabesiwafeguno.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/16187174614.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070139c888ac---limop.pdfIn PDF document text
    • http://zerosquareonline.com/file/94398081796.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/30939712250.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/korolulodexaxagigomewaz.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/71311166406.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1996eb0a27---tugadinuziposokak.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c881fd79a562082527f8069989cb6bbc/veloluzi.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/lanukax.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/renun.pdfIn PDF document text
    • http://semanbio.com/upload/files/91683388552.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d8ffaf684957e62bad6ee4cd8a7d42d3/peruzizadaxomisefore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=programa+de+fisica+de+decimo+grado+nicaragua+pdfPDF 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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 10920 bytes
SHA-256: 0ff7f6e1f933994255fcbe36d23bbfe2e8e0ceb82a5a8714cc758a76f15e0e1b
font_01_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 19436 bytes
SHA-256: 79f123647a7a54021e5ce47d85d4c9d1ebe14b714d51469a2ee8094d435453cd

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