Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaeb66d7209c6db…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 14:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e3c7ff26123a76617473e22b8ae63e7 SHA-1: cbbc893998e8043a5af3fc6c1363074005acbaab SHA-256: fdaeb66d7209c6dbd0fc6dfb8d3bd167d36ccb962fb9357c00a5c28e83c5d0ef
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, indicating the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://btfa.tw/upload/files/12352720962.pdf In PDF document text
    • https://lexcyberia.com/userfiles/files/pomaxijokomigilejotot.pdfIn PDF document text
    • https://pellevah.com/upload/files/furaxononirutitedivuzelob.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/budetutesitu.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zudosazumotulosijap.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/855402d562f96e3f7c673b97d69fb4d0/59392786119.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/wevezazidup.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/kibiwasiw.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138327c20bb3---demobafitupoletupunawex.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/wezized.pdfIn PDF document text
    • http://malifer.hu/upload/file/koxokunakejagowujidusek.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/9357563529.pdfIn PDF document text
    • https://defi128.com/userfiles/files/totufubazawinoruxitisid.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/17266630253.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/66231145681.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/kafogedililep.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/labojepipo.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/66775916108.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/36243905245.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/52897687690.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912045919.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/rulivomubepazegipeb.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zukexagiwokutikozotix.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/61106841740.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f0d54024ffd9d26e9ebaec7a50eaa861/19856816779.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/3668555589.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/redozimapumemitasof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+asphalt+5+mod+apkPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 19596 bytes
SHA-256: cbbb16bcafed0a25dac172a409327361813aaed28bbfb826c3df68560ee15fd7
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 10648 bytes
SHA-256: 53c5f51ed4b7f23ea8d7551c78a70f6a942d4c1235195d74b4669b56b35f8290

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