Malicious PDF — malware analysis report

Static analysis result for SHA-256 844ed4fae04a8d86…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 22:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d1cda22e038ec1a5fee0ea7aaedd7e3 SHA-1: 68daf47d6d54a0ff3b7b2bf8d7385e439de0db95 SHA-256: 844ed4fae04a8d868ae61a2f802c199da0701b75e55a96781f6db8b4b580bad1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous URLs pointing to potentially compromised WordPress uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or 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 http://fittbikese.hu/files/file/talarolafama.pdf In PDF document text
    • http://phonphangschool.com/upload/files/80405933020.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16118062046cab---10200665525.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zolofimanixajugow.pdfIn PDF document text
    • https://12shio3.com/contents/files/25830374193.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pjhrcq9cmq5kt1supshj8nspk7/5566728093.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/26839617053.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66054013169.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/dufirudomikabajaronanoven.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a465301b856fb344265f3384f8193bca/nevujivuwowobatimi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d886e7e7671a364c1f709079fbe30044/74527483264.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff97d103d6---47420573984.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7d7dd6b9---20695709371.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb13bacccc---31184879001.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d5f3f0a699bf5e277e8dec02ad03ae3d/13624098931.pdfIn PDF document text
    • https://mcitalianwine.com/file/wovanajowokizez.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe15633b9---64907886332.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/xuxuguvekiroxexi.pdfIn PDF document text
    • http://kccmaul.com/files/files/25487962854.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c5836fe3---868966057.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/34410785173.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/sidaluzuluvifotavilobi.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/38415296997.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e4b510ff3---nadufawiruza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hesston+530+baler+manualPDF 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_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 18272 bytes
SHA-256: 22dd53cfde4eec3055833a8c6df977adb38ae06d79a5d145898935761a11353e
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 10836 bytes
SHA-256: 5942ed03419b360937fabf3d2de319373d1be79eaf45bd02b2631fb04dcb5320
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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