Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6d7d2c48feb888…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 11:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b59e04242029c614e96f5e36d775832 SHA-1: 882ea1d148c8ad313743cb764de7759938b0c006 SHA-256: cb6d7d2c48feb888b81b2db7daf27f21211c8b47c7aee82ff7245e270c5f7e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs, many pointing to WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious content or phishing sites. The presence of these links and the overall structure indicate an attempt to lure users into visiting compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://allytemp.ru/uplcv?utm_term=tab+nothing+else+matters+acoustic PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d18f04fe---8160742118.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210828074756.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/cbe7e47d13ffeed135f5734975256735/bewidatatevibabi.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/nixanela.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/larugakevibutudoso.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608864d17561c---60009768509.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160986e9faf31c---83463089632.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c323e9ce2b3---37634484078.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16262182341733348751.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6ec8effb0c96f22927d0207ba32b6bdf/samudize.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/newigod.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ab14fc8e21a64fb1281b02d56d93121/kelemez.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zisipumawawutubatiwoxex.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/relagowixazudur.pdfIn PDF document text
    • http://brlairport.com/images/file/kevuxuwabaliwix.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073372d42191---77069618011.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/30089087396.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jmja9tr2c810b358ns5tqnnfo7/70604388472.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/57630630942.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea3f2eaa---96403518876.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d40c50dbe---18633752753.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/6076358738.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tokikalozalaguwidapilune.pdfIn PDF document text
    • http://protok.pro/upload/files/losasomemoratuboxoravu.pdfIn PDF document text
    • http://vladekoservis.ru/files/nelapopogixibo.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_off0000c18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18C 10880 bytes
SHA-256: 4c7b5d89bf1719b6586e224b42b72b5854568941520dba8e0cf2f7b87c45146d
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 17256 bytes
SHA-256: 5adf8a5078dff670d2b315636f12bdd4d8d4e04a4700b0461abab9a205553489

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