Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc43f76b7e332993…

MALICIOUS

PDF

92.5 KB Created: 2021-09-21 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 925592b59a48d0a56f1574896b8780ef SHA-1: 29b22809875fedc03e2ca2f23dd8a9fd61f3be80 SHA-256: bc43f76b7e332993046fb54925b2380167f269b34c13d1e54d81fa3b8d8d5461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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
  • 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://thumpamonpally.com/userfiles/file/46816746362.pdf In PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kuviso.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sotogixofo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xodazuzokuvodexekamedav.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/xoxavap.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138de2292700---vebubemimadawufisu.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/89535503010.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rogofekawu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/208d1645682a8e9311d2e86fe9dc15db/tajemugoxiped.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109201633267697.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c08519334---95821209140.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/13100390635.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/tupig.pdfIn PDF document text
    • http://markone-tools.com/upload/files/mubika.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/ziwijoxemirelanikuxizima.pdfIn PDF document text
    • http://nktrading.qa/file/files/fagorojiriditu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/197a147096beaf0799531754f2efd322/59281148201.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/77046536043.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/4490722026.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/gojeji.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/19780570139.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/89045607654.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/biseletebugotinaxosope.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d747ac57ba---rerigojifoligo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/52c5a1ad696847d620f83449091f1d95/93233976883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=position+time+graphs+and+velocity+time+graphsPDF 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_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11144 bytes
SHA-256: 0753dcfbac7c279513e60c0e25ee6b7d121f73aa13571b6aaf1b9b287e0be751
font_01_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 18352 bytes
SHA-256: f9b8722380f2766f7b15055dbca6181b9653fc0c5dedb294a92963896a89f646

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