Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb202111c93af300…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 05:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06cccdda0e1b48a06aceb630715c3a79 SHA-1: 048081ba930cb82a746b41e98c5bc5d848c1f58b SHA-256: bb202111c93af30030b173497eab44f6523b2de715115cc4e49a8fe77213c806
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=best+multiplayer+games+for+android+online+with+friends PDF link annotation
    • https://getracemirates.com/userfiles/files/74321215023.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210914171131.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pimajiz.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/kemosotorokimow.pdfIn PDF document text
    • http://ashleymongolia.mn/uploads/files/493887290.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/45431886350.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161423fbc48368---pudol.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109091203564035.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/37302624743.pdfIn PDF document text
    • http://gro-felix.si/uploads/61251069424.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/64643210366.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/35887335490.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/forekenogewemapifasox.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326cbd7b7bd---97965793328.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2293ac17---97077694070.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/jodegeforuwodulusa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff560ddb98---99166955175.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30637325787.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/lizofaruduz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451361a1a8f---fepimi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/webigisopidejemu.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/8336721565.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/sidomolevonafegogij.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/34222298108.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/fonadonaxalusupexira.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 17872 bytes
SHA-256: aafd041e7ba9df2107fcf169d5ad22f97cf5a5ec2b24048246033696357de67c
font_01_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 11296 bytes
SHA-256: 636a9f6f4a91bd62ce8bcb46ceda0592801f2182a11a707c87f5f387d515ff52
font_02_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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