Malicious PDF — malware analysis report

Static analysis result for SHA-256 6325a90c372a21b6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 14:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffd63d516423630cb9d916d3d4c3447b SHA-1: 116a454795b136601be072ea72c199f2a133430c SHA-256: 6325a90c372a21b65a58b5721aecf88797352fab82c7128b76a1553c1451a742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409252d85de---kipibovefopularexigene.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613153f06a4b8---fazopiket.pdf In PDF document text
    • https://hsdinstruments.nl/uploads/files/72190409840.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101001288100.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/21130218946.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/fatefepejenimageso.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffd579341cdd0393405636ce480dec17/20269864529.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/58066647723.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de399d0dd---rokasixezapalukogopusen.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sutujibexaxonanobawo.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/88387015450.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/mesupirepolikevexumemam.pdfIn PDF document text
    • https://zhansq.cn/upload/file/karumusizibovemepupiniku.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/36009546671.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/zebazelet.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/wisajenamexezaveba.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ed212ad1a952e37d5ff952cf80c75fd/bizuxolodefazugiwe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/499185aa9a9cef4ee01bed4fe4de4455/vokada.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/judepopagigubu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/lisepivonuzijosaginejif.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409252d85de---kipibovefopularexigene.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9df1b6a05---noxuzivexoz.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/88657339843.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/lewevaridixoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wallpaper+pixel+5PDF 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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 18096 bytes
SHA-256: b8af806e2c8d290df8aaaaf63104d5e2eb06af045e3e8f8f9a8438f221446ab3
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 9984 bytes
SHA-256: 79108a571236bbd4f1d1b969f6389b127ef2bc185cb31cdfdae6be70eb5825c7