Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab75703d5524371…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 04:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64bc147073063824c1b83beaea11d6d2 SHA-1: a0fb89a4c7d1624e91c3a1a40d9c74208bc9290c SHA-256: bab75703d552437142ed30addd0ed5fb7aa9d9b4100ad81d99037b3298cddfa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on potentially untrustworthy hosting. While no scripts were explicitly extracted, the nature of link farms in PDFs often leads to phishing or malware downloads, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2830

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://suliaok.com/v15/Upload/file/2021992237318228.pdf In PDF document text
    • http://vsrru.ru/userfiles/file/45770112194.pdfIn PDF document text
    • https://areicon.com/images/file/zevelido.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/19017820678.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/29595703190.pdfIn PDF document text
    • https://guijek.com/userfiles/file/lorabof.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/gipanugo.pdfIn PDF document text
    • http://chinalabware.ru/d/files/42692646243.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/52085462480.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/7453865623.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kikizokorajanerisuvojog.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d16655348---78104216572.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/42897530364.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210909003725.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/101de83d104deae2a958a8483c8a12f3/22719583101.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/nidevowagizuparalez.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/bekimodavizimipa.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/barosopapafanufi.pdfIn PDF document text
    • https://medtek.vn/storage/file/tined.pdfIn PDF document text
    • https://pr-dienst.ch/file/fawapilotizi.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/sebereg.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/82596853553.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c92932ef4f1d32686ca224fc8165e225/vuvagenamimuvetu.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/24741017033.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bademesulunojuwibiveziwi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161355e9fd8fee---59965830549.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614275b224561---83075499030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nocturne+sheet+musicPDF link annotation
    • 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_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 17220 bytes
SHA-256: c932cdf1cc502ee43284d402202039f02e0d0a461e371856900ad62679d72ef8
font_02_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10364 bytes
SHA-256: 60b1ae5f84e073af6105f45326c69b9f1eed1843e458b0cfe6f00511f4316990