Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae0ea5421246755…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 06:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c86ff88eaa974a4fc6f91f84888b22f SHA-1: d4ef1be13957a4ea54de08f4913c3b0457b65a8e SHA-256: 9ae0ea5421246755034541dfadf03108a86b228d6b16bb70ff804d75750f5df2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of a high-confidence ML detection and ClamAV signature for 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=how+to+get+pdf+book+on+kindle PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/hf5npf03ob1kt0mgo86387006b/logivobufesojemekerapamaz.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/26694843053.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pigedinuzoziti.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/90988456636.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/6886076486.pdfIn PDF document text
    • http://nenorm.com/files/files/71899604690.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/janalerifafukiw.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/tulumasafejevifila.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab895c7ab2---didetogas.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/xoduraxusa.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/35604637307.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/87693815125.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5900f5bb---fenakazegen.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/figanilolaguvape.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20783fa8a---tofikomebubuzotub.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/82725578233.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2g5ejc1a8kc3ifkcn304ihak55/giwodovupatajefusazutopir.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/napexemaduwikomuf.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/laferezolerotedexa.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/tewafimawamumatewobekifo.pdfIn PDF document text
    • http://fabtur.ru/upload/files/gixefavanunifor.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756ee94c48a---ziliri.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/vubexebe.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_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10552 bytes
SHA-256: 9037ae8aaf85434c1ce2e243af06e22898ce469dd5585df3f47554c38408ca9c
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 19180 bytes
SHA-256: 6c6c081396fe342d6a855227c406bc858b3b59d2355f812b400f5dd51a0ccd55

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