Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f311372827ed43…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 21:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84962be0d05048f91bf3386e42113bdb SHA-1: 01f06007dc1d0b249764ba12d927028992931a78 SHA-256: 76f311372827ed43118c6d35ab05cc6fb1f9c430089ef27ff84ea4a87aa78bfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

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://pixomot.ru/uplcv?utm_term=valentines+day+gif+funny PDF link annotation
    • https://skl.deindrukdemo.nl/upload/files/gekixinugevatozefor.pdfIn PDF document text
    • https://ratoempat.com/contents/files/dorup.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/73424825251.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/41132162587.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/binovutopavotesefivi.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/firoko.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/9118565509.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/perek.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wekeveberujide.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/rusepebugulagexenodul.pdfIn PDF document text
    • http://ladna.pl/user_images/file/64879740415.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/guwojaxiz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330427dcb79---jokir.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9c4a08cb---67305373121.pdfIn PDF document text
    • https://wineart.online/userfiles/file/49607572680.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/21450840661.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/62540201477.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/42362043924.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/36965624847.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404ab1ac349---34175621752.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/dokos.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cf7ac544121d9aa66ddc484f78c65802/bikiraxe.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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 10492 bytes
SHA-256: 0c205246f516921dbc749cd3d2b38f2ff53ffc41073831fde57c70fb63a13b1f
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 17164 bytes
SHA-256: 0bb77cdcb389d9ecf01cf3e883e1a66d111703867f92bef42819dd3bce6ec3f9
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1