Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e66d049cb2f4e8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 20:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0b7e51c148c1231e1e37be855f5e91a SHA-1: fd8d36d9398bb5a90376918a3a86845103f4195c SHA-256: 74e66d049cb2f4e82fd87a46db6f0c5634556e0f094e53ff3606766c7cc78c1f
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, classifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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 http://rosniyom.com/userfiles/files/totupogemikefabunamoger.pdf In PDF document text
    • http://www.urbanwaterways.info/files/vowarifemaka.pdfIn PDF document text
    • http://getvisa.ru/images/File/36593351398.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/55392415623.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4e02ee82---zutedepozofuxara.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/50650365058.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigefobakagidizopezi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9e40a066---rinonupizonep.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/goxasugulo.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/60799174342.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/febufageduseri.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_14_02_31_04_4103.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/judizu.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/sagori.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/mazivepew.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/darowopejivaxuwuvivodog.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631576735.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61345b76f---tikagubavobidigelej.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/gobilurovodixunopivolaji.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c972c72c6a---53644818107.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8e9c7ee9---13795135450.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rolix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+movies+together+on+messengerPDF 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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 17964 bytes
SHA-256: ebeab727641adedb82c2137127ac06958fdce1684708619352dfbc6d7d52e607
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10692 bytes
SHA-256: bf0d3c0ff9fb9619b39fd0225d0a7b2736e176dc34da48f7f96fd12ab6d1b7cf
font_02_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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