Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd8490538daba3…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 08:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3aad063a1b1f0dfc6a8541c9dd8912c5 SHA-1: 397b9cafb8a3084fe469b129815865cde33ddb0d SHA-256: 28bd8490538daba3487d5d7d662603adac788f5b2fd88902743450628eaf352c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tarzminder.com/resimler/files/tipuveruzudozilubiteweb.pdf In PDF document text
    • https://akonis.ch/userfiles/files/pulogezurapis.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/wuvuzedixafonuva.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210919122952.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/tepejowususaseranebobe.pdfIn PDF document text
    • https://beaszemin.com/files/60964402927.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/26943487150.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/14046164607.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/soxetiretipaboxobazibobu.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/82649301869.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/89395221118.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c0d667dd---99971585061.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/3045869794.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/95754657033.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/dinaner.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/napuvixijalodajetulamid.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qfs1l4jlmme54jp9lqp1i5jdi6/guwajevivesifed.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/26919818340.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133de9aac2e2---48806216071.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/sapomowomedez.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/74723945227.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/gokupax.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/60401651857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sione%27s+wedding+watch+onlinePDF link annotation
    • http://abcs.umontreal.ca/upload/files/40474345061.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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 10744 bytes
SHA-256: f11aaca305fdf9e5d38c3247e863f73cec525480062c66f23f6d568aad8b0d25
font_02_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 15544 bytes
SHA-256: 3882ba7fd545b11ce15c896c767ebadd03fb9441bda745948cdfc9f2915c361c

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