Malicious PDF — malware analysis report

Static analysis result for SHA-256 6626f3968a555f17…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 12:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9a86be9755312b610d74a5c85b48bc9 SHA-1: dc11f87f1458b5a5c4652d176d57abad0671c1e9 SHA-256: 6626f3968a555f179d4476890d4dcaab661422f551d093cb82156d2a25553bbe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown PDF files hosted on various domains. Heuristics indicate a 'link farm' pattern, suggesting the document's primary purpose is to redirect users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.wiz-fac.com/uploadImg/file/48221601446.pdf In PDF document text
    • http://colescastle.com/clients/875019/File/baratutinemo.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/nokobadovasevojugupugizeb.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/lugeru.pdfIn PDF document text
    • https://baongochoa.com/upload/file/87341127242.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/mosixuzedinameb.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/93444804672.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607d416167c4c---30701681966.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5947522c7---37477622761.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/beb1a11921eb6e4dc2fd93c09dedd28f/najazipolenowobazisixipi.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93843d17f3---97230023446.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/38015138780.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/36929936683.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rupm6hm0ptpjcrudfobpq970ca/14056788676.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1a2590b5f0264131fb64d08ee1016017/10853660554.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/tibozu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/46761507357.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/vatukowe.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/jokoxerikubuko.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210714_980DEC6D25AE7D59.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fibigapitelubewemomedex.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084362fcb19e---68158341964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=3+player+sequence+rulesPDF link annotation
    • 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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 17160 bytes
SHA-256: 8c82ce557c25dc9a95948455603ec04dc8bccfb05193c14649749bf5499f9611
font_01_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 10492 bytes
SHA-256: 1d7ba80ff0c1499ce982e4d1915c36fe63b3d5a05579b4b6567f37d83882224e
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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