Malicious PDF — malware analysis report

Static analysis result for SHA-256 98786d999004d796…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 20:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f65b0dfe46c1b72a1ae467c43d69b12 SHA-1: 5315559a9ca7661da1dd97dfd63d6caf44f59b26 SHA-256: 98786d999004d79669f7716b7bd4682c770fd519529d76c6cedba5126b46cb49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or host malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=real+car+parking+2+car+driving+simulator+2021+unlimited+money PDF link annotation
    • http://aguito.madteam.net/ckfinder/userfiles/files/gabuvilizijadujunosu.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/24348593406.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/pegegawerokopewerijunof.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/96843309454.pdfIn PDF document text
    • http://slovoveri.org/userfiles/857201478.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/45191135406.pdfIn PDF document text
    • https://j26clean.com/upload/files/81393635310.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/479347306.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/putijizaneravum.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210910_224626.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/56962836176.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gewisowinotat.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/95614765730.pdfIn PDF document text
    • http://epicridesnepal.com/files/fodadadupisulixuxipaw.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/17070253631.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d26f5f2---sigafapegefemumivutobesa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8084c222---45447473890.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/mawipavakiva.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/96273207062.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/fepixupodakifunamiveli.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c2ccb38---72794944733.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/paxalimujajadub.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/31181317998.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/49087382931.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/pavezan.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_off0000af47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF47 11568 bytes
SHA-256: af3544813ed31ea7732b7c41419a0d011cd46b94ff5a956a18c04baf9cda06d8
font_01_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 15300 bytes
SHA-256: 993b2749d3ef865c2e35843e8423613d7b86c64d59d5e632a12af5a0d1baee4f
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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