Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a9bc82c6a330d3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 18:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b30b0295b2f7b95f27809ae0ca316c3c SHA-1: f15e8a33d0ba56d346e9ecc9b8e8b22a7f9f34fe SHA-256: 16a9bc82c6a330d3296550219ef59d719d0c0d15244aca56c57024177c488295
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards exploitation for client execution, likely via a downloaded payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=how+to+get+unlimited+food+in+dragon+city PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614130665dd15---21625486125.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343239cb5e2---rutokokedazi.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/71109577511.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pivimemut.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vepimenoweboputusidade.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/9755950839.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/9509138409.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/21048846055.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/38892711500.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/jezijuzefiwotaserim.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/67420543704.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/pasegijonatomuvukex.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/940726a30633dd201f34840808af19bc/10867298896.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/56697072656.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/wenolofevati.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/pifopozolilipen.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109030501545158.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/lumagamuxuze.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/muregavibovibiza.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59330587432.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/13f4cf258d938754b22fa0de19a37776/64676761292.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/768950953.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://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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 18088 bytes
SHA-256: 52c306c53f8bc05a6c58dea2df255da218776770ef63db59ed0b3e82ecd1d6f1
font_01_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 10940 bytes
SHA-256: 1549f61688a5479456fd7aedeb046863be49aaf6ae3b2bc8fabeb4e70a3eb99c

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