Malicious PDF — malware analysis report

Static analysis result for SHA-256 781e75b8176b918d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 02:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b7223f0ccd6ea927af1bfab23e85250 SHA-1: 97a2d98f33cb7e530a82f1dc61bd685174a1c55b SHA-256: 781e75b8176b918dbcc56e756e741be0503a382a5920108eed97a72030448e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/518d874458eb59e2466513d392563ef8/jalogo.pdf In PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/tusob.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/91253339686.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/koradojalovipafozetu.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30681531250.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/89097676154.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/susamobixuzuperadi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614690a669846---jobikuwonulabimirepego.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6kdad7ctaqujm7rahkpc6buod5/lenabivapipo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/61188788893.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/datoguzu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382cf9eccdd---popizofakoninivaz.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/82931578260.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca2ae7ec6---silapujesuxilamofijixukoz.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tovufexisagibatov.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/woxidupirilenozepekuxuwe.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/98488106276.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/41987778127.pdfIn PDF document text
    • http://dentherapia.hu/files/file/paguwodezet.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/39313684338.pdfIn PDF document text
    • http://a-pluset.com/userfiles/51839756324.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c04b7251---92963568982.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/32372175991.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/64610682881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=maps+for+minecraft+pe+download+apkPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 19032 bytes
SHA-256: e0f2eae172d40add9970faaa10d7d514be8d727584263b5c9b67fb34593a14c4
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 10952 bytes
SHA-256: 4e0ef37a440171766a741760dd5c091c0071f9d86783b13d56fff35911612699
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.