Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7ef1606bcec95…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 02:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0125ad2e30a87e65677fe1dd73a813c1 SHA-1: 7f45e23163417aa34b53f34f33bb05a2721d6e2b SHA-256: 77c7ef1606bcec9567e22c5277ff70747f652fca6c5dadfc9559c194e6b82dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://krisoc.ru/uplcv?utm_term=off+road+truck+apk PDF link annotation
    • https://alhurwallpaper.com/Files/files/bomepofoxapofivikitafon.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/22919434223.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/40734532306.pdfIn PDF document text
    • http://letdentalab.com/img/files/rekijurixasemufevi.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/rogidasubifidixalute.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pulikab.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/68324657146.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/33564543902.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/vugamipukejujegetumu.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/gabibufifomanofokuda.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97345087424.pdfIn PDF document text
    • http://kaies.net/upfiles/210904074944992386w2np50.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/lonujefesupasuretusu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ef44e6a5---jugapexilejo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/reduxofaxuvazunod.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/xemusixefoxugututi.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/2360237706.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe52ce59c---botumofepozibiratuniw.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fatapexibokaratanuvej.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/92696012928.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4121198d7---puperopatojoxifekemaw.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/39460394383.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c646c88---ruxusakujil.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wusuzevizaruwek.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363196b3fad---sudinomosevimuw.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/nimivujajepanofejorom.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c15174384---buxojatira.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 18036 bytes
SHA-256: 10c0efe2d9b7181d6befcfbed2963930e20fb928b258302df687486de6d1a29f
font_02_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 10288 bytes
SHA-256: a1b423f38e4c111941ab17fa14f8f4c0e6959197e8f9a0de799e5f700f4c22a4

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