Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0585c887c68731a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 00:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c6e7880f0496319e8bea91743826b63 SHA-1: 0a6828a11c3a75b47dac36b5c0c4d2b234ec3b60 SHA-256: f0585c887c68731a72c1bfb199dc7a099e9a3356e27ea226b50e1051509a6662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing further support this attack pattern. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=ship+tycoon+hack+apk PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f31ea15f---fetakikatufar.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/80535658373.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/48309212f708ad293550c65f898105f5/65341984165.pdfIn PDF document text
    • https://maria-galland.ru/files/file/wewepeje.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/85869716081.pdfIn PDF document text
    • http://pololanna.com/user_img/files/15750464682.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cf74b0ac12117a52e3715318bcaa9be5/pawer.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/6632261809.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sebawujosawere.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/19008989078.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/21515201129.pdfIn PDF document text
    • http://keacg.com/upload/files/24460170018.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210901081929.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/63733353526.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/bojiwizavijeb.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nepexijaxubofiginaxapa.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/sabemasivafinogiz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b2de9be5---kejalodifeku.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/puvadawefunirudugaleza.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/vediso.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/46938934992.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/660898945.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/34744735255.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/zavagaxebopiwejega.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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 17980 bytes
SHA-256: 0785197a3c73fce3f76ed9d54d63de9fff194b56b28d45b4f9a726264c6a307f
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 10304 bytes
SHA-256: 056ea6211bac2bbb61498ef50eb066f36f8d292230ece7c09ce91bb78893e391

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