Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5899576ba111e1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 19:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be25386666cfd4ef7a55d467b03675f2 SHA-1: 798b67f3d94ebbb094a9e206787155b9e2629221 SHA-256: 8b5899576ba111e1dfe2c6375e75490496754a996bf3f32e4c1774c4372a1de1
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'link farm on disposable hosting' heuristic further supports this, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=hotstar+apk+for+mi+tv PDF link annotation
    • http://hz-karavany.cz/ckfinder/userfiles/files/bijawalem.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/91159599744.pdfIn PDF document text
    • http://lg-palette.com/upload/files/favorelokezotenax.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/fulapokizegazax.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jewidizataragazeju.pdfIn PDF document text
    • http://findacommodity.com/upload/file/11913456621.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/47282656056.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/39112364869.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/42125001526.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wumirasoripupumomalefava.pdfIn PDF document text
    • https://digireg.com/upload/90743427841.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/97247711186.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/gazonobiduledopixas.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f6a84c47f84aaa92f113e6e696799adb/44149731344.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jexaguwabuwewukuro.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/venipojinimonajevuweviruz.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/2197082948.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161334c452d56e---xitasizomo.pdfIn PDF document text
    • https://tonitomov.com/picture/file/puzojetexizuv.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210921041727_491247422.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/pugonipinobotuk.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/44731507750.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c0d1c809---nudulawifuripijefiwupi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ec1fcceb3---28601302871.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/62240255049.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/20685404738.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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17836 bytes
SHA-256: 78b4abab9db5ca57ea3ef3ed630303a84ecc522e2b2d5f81265a4d0c5b9ceaab
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10388 bytes
SHA-256: 8834b8ea92d2e1c5360124702b633d2d09c18c1769fa090dcdaac404bf3d1da2

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