Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cb8e70453db974…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 21:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ab082789f9bbcc76ba2744cc9f4b157 SHA-1: 4c548486766cd0338a855d438acd41be7d2f6a1e SHA-256: 38cb8e70453db9745a3e336b0337eb61258ffa528d80e667c99b861d83526648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload directories and other disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142562f74069---66452363138.pdf In PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/47300792767.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/bafamuzagovalasubapuloxuv.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/dujiwigukij.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/japitox.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/vowojeligakitabu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pobiluzibazokemuzovav.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/razebiw.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/kotuxetaxavovorazuxibewit.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/tekiratuvuzowodalekakega.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/jijolasatorad.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/66928489235.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7e6206de30054398be4a64b46c03e079/jalogodofedopiti.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/liveneleruvafuvolu.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210903/file/16306840448554.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9d6f2770---9618154983.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/tonukidisorigexid.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d470bcb5b7e0e439dfa5d6bb31b9dbcc/wukowe.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/nazevurina.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210910055640.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/15056155201.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45d2b5137---6623797723.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbd934261---10549593616.pdfIn PDF document text
    • https://zhansq.cn/upload/file/76124958574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sophos+mobile+control+apk+downloadPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 11172 bytes
SHA-256: b62959bf9ecf5860f0f64a4bd0393d967b104479bba9d5c61c7df57cc10c38bb
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 18132 bytes
SHA-256: 47a54db698ace32bf1b8fd07ccaa384a4b2c0f312fb5ca5b3ee8edf996b2f676

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