Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a26304f983e09…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 05:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ff1c3c291366264a3ad55c2e79729185 SHA-1: b1a2280364056dc4f16baafde9a9d845dee2434e SHA-256: db5a26304f983e094a7ed7a360b205ea2f4fcf8447edc2645b056683a5fa0fe2
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. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=programming+languages+for+android+games PDF link annotation
    • http://cualuoiskydoor.com/webroot/img/files/37639188026.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/bovefijapudifefuwekosonim.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/luvezarofipififoj.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f02bc2b76---51849372233.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/36899494633.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/95326918873.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/lesuvebob.pdfIn PDF document text
    • https://tigaintan.com/contents/files/98632464265.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/76622714607.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/12e4108c9f88f5784c8118dd45365f58/wuxewafiseviresowepanu.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/94662035310.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jegelejas.pdfIn PDF document text
    • http://rs-entp.com/upload/file/10681350129.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/15029728850.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133469123b98---fewemisoped.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jodigizakepi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e4acd16b37edc4c06ea5acaa62e5ebb0/76777553464.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/vajezediwuguduxegu.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/62074841634.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/60138914338.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/lewijawuwezexaralonokame.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e736b49f2---segaji.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134c22f9703a---6952207326.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///lasudofepuvinimugave.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/momubefunosigedupetib.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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 15592 bytes
SHA-256: 30b82b0f0bcb68c7920105caa65342aae54205be6d3c671fd092848100a542e2
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 10700 bytes
SHA-256: 1af73ebc6d9b15178c280d8af1d79e0b443f32b66fa4417356a090b7d51a045b

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