Malicious PDF — malware analysis report

Static analysis result for SHA-256 d950e7649a39d4e5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 10:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bcfd47ef9026d0868e382e3824a6082 SHA-1: c8a3a1ac5e45ee7ddc49670ed20d0c6f3d8fe9e0 SHA-256: d950e7649a39d4e5794ec29d29b8fe17cb34e83481fd77742cba5b7e4ab2fa3a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics indicate a strong likelihood of malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://seoulmenu.com/uploads/files/jisafanozutaj.pdf In PDF document text
    • https://dlt-nkp.com/fileupload/file/5179770440.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/33536960130.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/30461722665.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pifof.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d059115940---terolakobawuvabajeko.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613154b1b8543---33232984249.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_A3790CA83A57F82B.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/dipimikatugofebifed.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zoxefapegozagutatugadivu.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/serokonafimamuzixafe.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/44313651329.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea3155065---fasitesilezugofefepemefu.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/77817093524.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/40504462014.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329ae817c42---67093737065.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sereredozow.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/28679669454.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/52033171383.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/25230616928.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/69446470141.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/liginuvetofitikofirili.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/111723045.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/da03f2a886e15be30406054c424e70d8/figevoligabiwepolivolekum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+whatsapp+web+pro+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_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 10716 bytes
SHA-256: 4ddc0931180d241fe4a7255dbf4e811535459689308e3e206e75d11d7e21884a
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 18584 bytes
SHA-256: 6a95958025719e892fb57fa84c3d0ded85fda95e4fc04858cd1b41cd2707727e
font_02_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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