Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4373de4c5e6b16…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 13:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 763265f15437d8c8cabb90bdf79cf0d6 SHA-1: 56d5ee6544442dc7c37de2736d4fab11c3f77d92 SHA-256: 9a4373de4c5e6b166874a7eea72d55d2d8f338093b9e266ec65ab26dbd0cf51b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=create+playlist+vlc+android PDF link annotation
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142344c65a50---17207803953.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/joredew.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/sijatuv.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/13534304093.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/24482404571.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/13226541276.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/gamuloputulinexizofed.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459b3ad5c29---58751569398.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136532d97e8c---62507975957.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c9b2bfdf3aa357941d260857c64f614/667901048.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/lakavebavubal.pdfIn PDF document text
    • http://stl-hk.net/userfiles/23409242316.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63553999148.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/29072545888.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/76619422952.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6afaf03709aabc255cc9dc5bc0492d4a/51298780844.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/72769023874.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1e2599b1---90127434926.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131e25020beb---kidonarewonorutotiwaw.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zajibokef.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/ziwoxutisiramudufimavenuv.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/70083180519.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aedbf03a4---pomotemujedodopegubolipu.pdfIn PDF document text
    • http://www.520amis.com/upload/files/47860617782.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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10716 bytes
SHA-256: 9983e81bfe06aa90f2dac7ea77946f68b5640e0d40067b43a31b7ae3b2418f4d
font_02_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 19068 bytes
SHA-256: f7689324739ae2ae19cb39b81b74b6724cf4085ff77d2f0955557f462f6b1044

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