Malicious PDF — malware analysis report

Static analysis result for SHA-256 78761f89a6b13042…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 12:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 74ddd8d963b6f59d8c56c8a07831e86f SHA-1: 95a1756254ea3d4bed5559258eba979515a8992d SHA-256: 78761f89a6b1304293008d4ae51d33db022a52458527b77efa4ec3eb950c2e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=one+piece+treasure+cruise+god+mode PDF link annotation
    • http://aligokdemir.com/resimler/files/jojodilinoteluzopamazene.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/rukasajewekux.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34e8eb06d---42249923885.pdfIn PDF document text
    • http://maxbrio.kr/files/files/nolonoma.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/pugujuzureterunivam.pdfIn PDF document text
    • http://4bx.pl/public/file/99158109590.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/49849146263.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/87027761081.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/rokugotal.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/65722923936.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/26797099516.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/42954264282.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/rufagiwazagarulal.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/dosodapisumifumataseb.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9170022303398dae0fcc0ac1685b6980/fuzad.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/513e100fce42430bacd118639a9739d7/vaxoxipavepumeripeteza.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/2372904138.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9672b466---verowopefodowururu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/80502409267.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/79974967555.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_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 16548 bytes
SHA-256: 70d93f3beb4d2cff884feb5343ae7bed2aafcd8843ecc645edac985685c59a43
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10936 bytes
SHA-256: 762e0dc822d030b0d230728a6b98529254e7e3238dfdf11d83b933506bed5a51