Malicious PDF — malware analysis report

Static analysis result for SHA-256 af921a26d0eb686f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 22:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8953bb6da944d53fec4d3b67a4aa0a8 SHA-1: 1de90b7c6b10ec877f9e043f7fb316b890be4ab0 SHA-256: af921a26d0eb686fc5c6800465117a03357aa083f4ef88df591364c61c64cdf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or SEO poisoning attack. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=how+to+rotate+in+foxit+pdf+editor PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c186d682686---70098783774.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/96de6a2dca4e05e119d03144832fa773/59365744819.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gazarazoneg.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d470c97ea50b402129085467b897dcc5/91997403536.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210606161224.pdfIn PDF document text
    • http://arslanemlak.come/file/lolopivuxobuz.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/77429640387.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/20369656422.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3de6b18e---76011963547.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5n7b1slshbqvks3vopi35o1he4/populefanedonamizezenalew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd5ec5d28a---3882804009.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/78285559306.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/3357073123.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/16469798009.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ff7b642b261b21386a7b11f7490c41e8/pivogunazarelenoviv.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/15275013110.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/96253207390.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/72315691870.pdfIn PDF document text
    • https://emprenderem.cl/files/noloruxapojurijov.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8d387d6cd60d2406f759096d98764fcb/6778508611.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc33291a7---wodosuriremizibopunosonur.pdfIn PDF document text
    • http://cartopack.com/Images/file/mazelanurilebiwojuxoli.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/77203425541.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/59171750875.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 10456 bytes
SHA-256: 7d06d478f741f59f82a666376ee5d8368c5fd55be228422a47b86c5d15493b98
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 18392 bytes
SHA-256: 086f65bff2d524a6b6a7ab856896f524e99a418376793e5a20799356641c963e
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1