Malicious PDF — malware analysis report

Static analysis result for SHA-256 16144a7688fc4714…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 19:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89f0fdee73ca6c8775ec73b4785052ec SHA-1: c3cef159a0c31d0886eeadba7e6779be5c2dcd21 SHA-256: 16144a7688fc471424edae8a8a90b922848d761cd66b8a57f3a1467aa2a36a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4f8c5ec7---bafibufe.pdf In PDF document text
    • https://betsin.org/userfiles/files/60757610948.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/nexeruludimo.pdfIn PDF document text
    • http://jsdarvin.com/files/31419366617.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109030115411009.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/28510747947.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/bogul.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/pugizepofapolivariloxod.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/guxuf.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/51495721148.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/87871088840.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/49900151159.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210906112209.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/genodologabisamitugusudu.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/95472316613.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/76127313047.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355635c8491---22358313826.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/zuzuwulavoxoji.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mowozavoj.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d4f7a3fa---kobek.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908100301.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/botabonutivulot.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51856223800.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/32035522651.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/zokinidolarorupo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/30989427138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+4g+network+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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10564 bytes
SHA-256: ae02390856086ca4fc2c5f0517c4f29c2f92add78f6eb9ad9a2cbcdf7e6b9277
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 19560 bytes
SHA-256: a979bfcaf83e4bd620ee4e7bfa0ae8645fdda1dd3cfb4084480944bfcda28857
font_02_sfnt_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1