Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acfe9c58b1a786b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 22:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b42dec452b41d3893cf4a77318739e83 SHA-1: 294bbbb8491e8240d41bb901260576834140d681 SHA-256: 8acfe9c58b1a786bf57e79f6057cfe267b6718e8a7f56bacbdec580cfcb530f1
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

Heuristics 5

  • 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
  • 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://mayinmaunhat.com/upload/files/josazepetesarewitu.pdf In PDF document text
    • http://yarpb.ru/pic/userfile/86500508374.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/luvoxetepirugozuzamojowi.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/kavid.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/20083054625.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909010636.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/ranadib.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07167252a---ruleguxinosusebipuvisu.pdfIn PDF document text
    • http://naviway.su/upload/files/23965346869.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/75965823561.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd48c40b2a---31609061444.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/6944053549.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613854aac291b---79345280362.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/35328642870.pdfIn PDF document text
    • http://builderall.info/userfiles/file/morejipesumij.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/wudibetenewebokig.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wapixoluzufupud.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/49715784467.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908193354.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab723bf932---bidozabe.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/33009611129.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/xonox.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/46217427346.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/856b79cfe4e16b1a548032a3435ebaab/dusikagowitem.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/frpsk5igb5jjbggfcnlg4fpi7n/97468942811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pocket+era+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 18440 bytes
SHA-256: af503c46fc4a91b1224f06ddcbfbdcb15168149a5e24afce66144114b764c188
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10048 bytes
SHA-256: 81ca70cb40070f095053bacdec0d6b6ae9e7b4d745ca22de4a6c6fe8f8056b67

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