Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f427f769b1fc7de…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 23:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d21d8640789c8c9c8e844cc18bd10fa9 SHA-1: 3a8d4a9755294a67db1619da29490d55413de980 SHA-256: 5f427f769b1fc7dedd48b063a6ff1ee4b2704c50f05f4b1b77764320a7a8a126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF acts as a link farm to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+get+app+apk PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614872668aa86---xiwereviduw.pdfIn PDF document text
    • http://1careglobal.com/upload/files/99583793596.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/49414273145.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/rasugitejivenez.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vugakexejupodimox.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/tunenododavexelapinobeses.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/4800622668.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/belulodunibene.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/78590270961.pdfIn PDF document text
    • http://henca.com/files/details/file/64496970738.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/tovotedogukew.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lalutegiri.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d13ce3691---62287387820.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/tegozigafawozimubuvajez.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aa40e8a7f7445ed06560570223a36b34/dovusasemopuzipadaporot.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/68831593801.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ovinupipuwov.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/99145149642.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-23/20210923171152235108.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1f5d0be3---geliv.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/wafojigitexan.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/56452265433.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ba45385472f3dc998b60d4d936bb05bd/82067508772.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/70869076391.pdfIn PDF document text
    • http://halaljones.com/uploads/files/mokaxigipimaradi.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_off0000b44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 10084 bytes
SHA-256: 2260f923134bb561446b92b9043388aaaa8edb33a9f030730095920228a22264
font_02_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 15532 bytes
SHA-256: 1ccae363dea6a6da9f25c3de675be58de11cc0399b3e3f19487034778278a82e

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