Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e84f55a94297f9…

MALICIOUS

PDF

81.9 KB Created: 2021-08-29 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e98fd670c9c491c12a65604115619d23 SHA-1: 536af5f1d15dcb71d2f5c9ba0bd93fd1d272fefc SHA-256: c4e84f55a94297f9d549d3c2e15b90a7e6f4e3e0b015fc1a0c21037bc41a70e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=rival+stars+horse+racing+mobile PDF link annotation
    • http://bluecars.pl/userfiles/file/44847224532.pdfIn PDF document text
    • http://18554080.com/userfiles/file/59836262172.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/wepunorejubigoroku.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/645fa5d1276dc39859dc1447646631fd/xuxavuvupodogutodelajaf.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/82041633411.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3cc0d59e---junejiwafijikojorijowaxe.pdfIn PDF document text
    • https://advik.net/userfiles/file/gazixi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///99633942561.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/biwekulividijamuduwus.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b810702d---gawunuxatoxojimizozizudim.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/vopufepononujaxosabefusig.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/lavologureruzokeg.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/40a799ed2321db09264515cd064afa17/powede.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9239dc10c---49697055460.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/komokifa.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098baba8ec78---wisaxudokenudubujodawena.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/69663469184.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/89435946065.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8aac585cf---57124687222.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210719022210.pdfIn PDF document text
    • http://drtamerturan.com/file/64365628999.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/dogifefawinoseseleroboj.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16824 bytes
SHA-256: 18de724cbb82a5a7683a1c6e822dc9581ad44de323e6223007088ab53f629222
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10928 bytes
SHA-256: 9245ac2e110f2f2c19b403483e10e021edfe31cc93082b47a4b4080983ca3b9d
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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