Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a437d3d6e57f0b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 11:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c4a32e9ffb82a1e4ddc24574a3f6d4a SHA-1: 33e62ab2e6a999fd22265a6f3a25bba8a70e14f6 SHA-256: b9a437d3d6e57f0bdf2271b15a92da80be585fc7f79c44c508db055b9304dc2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://huntic.ru/uplcv?utm_term=happy+thanksgiving+pictures+clip+art PDF link annotation
    • https://ssvacancy.com/ckfinder/userfiles/files/25970860547.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7292dcf4cfc97cf7a357dec4abb8bbf9/jabasavejesadupexezem.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607654f29ebc8---44151425894.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51b19f50c---23686096423.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092637ecc728---74954167225.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/mikokilo.pdfIn PDF document text
    • http://boldogelet.hu/media/pixirijabelez.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1468469494.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/97224012501.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/13019627312.pdfIn PDF document text
    • http://scro.ru/pic/file/87259786224.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/11053687046.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/fegezafewunugimopebumed.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/debevejizelurezonetidune.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/vikor.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/voguwomosilafaj.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/62907594492.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/5065850252.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gemiredufutivomulid.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/sasajuxad.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xarenigomekuketol.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/411ef901811cbe9718e7e597d6e38a5e/zomujajogodip.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sawelisonabigenilatiwusi.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/76018509247.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_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 18156 bytes
SHA-256: 70852481568d198a6698b264bae5cac03fc126806bd8c9d06f502e46785ba8b8
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10896 bytes
SHA-256: 7275b987bf7d9836aab95cea8a986591c63303fb6fb555ab8162df66aac65361

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