Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca88c5bc0d67e94…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 17:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75ff37ae75e0d195dc8acf6069627072 SHA-1: b5b2f63b13d69e72b3e82c1c2ff34ab5ea2c317e SHA-256: cca88c5bc0d67e948abdadcd6546f81f2b0d70173bddf0cab42ef6fae57b0a2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy hosting, suggesting an intent to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=screen+rotation+pro+apk PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1d3f30ac---naxumetusijazu.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/xefegepamusaliparofivuweb.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/56937875107.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/30942877718.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/pujirawogufofavekawuzewi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/juleke.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/dogidewaxu.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/jaruko.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vozonoxinuzibo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kkjmovp95r0kstorlq2ltqbd33/89302135621.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/88851748187.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0hjpn6bi9nn53sad211g6g36qd/31445619699.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/58641376924.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/lonefepu.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/53439503613.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/xijixamisaboranawu.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/43245522302.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/50821849440.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/42797874440.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/lolovasifepagusi.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zefamafiminevowibek.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/pewununekerilunutameli.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff0002e8c---xavitixatebebefugone.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/42555961318.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/72082995930.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/kaxisapamed.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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 18512 bytes
SHA-256: ee31c11601313584eecfa7a9bf90138555882b384c371a42a8cb9f21ba8f4e09
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 10320 bytes
SHA-256: 63d3ccf08518ebc3e3284f6c04bae34cd37a7250d35df11ffa45a87439daa8bc
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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