Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4351bcf7d8724d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 10:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: faaa25b11d8195ec7a5efb1ea2d6d387 SHA-1: 9d578168392262f9df7dd2dc3d669983e22c964a SHA-256: 8c4351bcf7d8724daef228c1258cefdaefaa057994dd2d91bf3e3599b8befca8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing lure, indicated by its small size and image-heavy content, designed to trick users into clicking embedded links. The numerous extracted URLs, many hosted on compromised CMS uploads or disposable domains, suggest a link farm intended to redirect users to malicious sites. ClamAV and ML classifiers confirm its malicious nature, likely serving as a dropper or redirector for further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=how+do+i+use+skype+on+my+android+phone PDF link annotation
    • http://dhleisure.com/ckupload/files/44725865648.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/55707532200.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25685023687.pdfIn PDF document text
    • https://nevisnews.com/userfiles/15813239427.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/24218976119.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/63738502159.pdfIn PDF document text
    • https://tekartltd.com/upload/files/65814082376.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161427a40acd06---62869044020.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/88924729626.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/45688099748.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/7939967629.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55286395232.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xatofed.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29587710032.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d145135f0---jexake.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/ninuwetobonimowizini.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210921074608.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/72331989404.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/wazijisoborefibubepubezex.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109041346078523.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/puvolokaxi.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/47882866039.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1eacf5c5921533cced61879ab0ec02f3/94744978675.pdfIn PDF document text
    • http://topas.lt/userfiles/file/tamokexomekifomogafokox.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136955223d8c---sepitivirasorugadisu.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/juxufutowinedimamano.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_off0000b38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 10896 bytes
SHA-256: aa82aa5226f66de7d2f9e1086f6b7419cd02a6ded87fb98a7e8c7f6197a562cc
font_02_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 14236 bytes
SHA-256: 3646bdb0dc86086acaec0c0763cc6c9dc932ca809929f1d615a776de62d4cf9d

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