Malicious PDF — malware analysis report

Static analysis result for SHA-256 435012dd90b94b7b…

MALICIOUS

PDF

97.9 KB Created: 2021-08-22 21:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5fbf1ebf69792bfb0f0bf3b9fcb3ca3 SHA-1: 2497abbf08c61c348c0c532ea353e9a4d7cca5cd SHA-256: 435012dd90b94b7b37fc663125eb18a8536078e0a912da97cd86ed0e3203faa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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://tks-forever.com/upload/2021/08/03/file/91789189195.pdf In PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/27817359678.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/tujesas.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/4628668723.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/15314345245.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/sulizemosiwoduwawuvixebow.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/83404506209.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/18742447302.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dceb0bdb97ad796e996a4614510c4517/varezoxubotiwen.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/denurisujibekigibire.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/87172518083.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/rifofuwejifulaxenipapo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3145d4cfd44f1e59f33cb9bce162dc67/36785739342.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tr6s15k48d4n5pbl918406o8ee/4454514610.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7f69c89f---xupimufuwawefemaso.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/lusofifunaropolamid.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/261602382.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/68986118045.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d3cd29d9c---tuvavixogi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092eac403aed---wevipukiji.pdfIn PDF document text
    • http://erdbau-rauch.at/zumipaxidofom.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dac7b0997fb---dadixirik.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cbcec2ef4d6f6b671d7fb74ad0f204c4/81599708983.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a96cbd2---wakudugakinu.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wufanerawunupafetife.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kumh9rdiegvkv0h2bnpvjogn7g/melobogejovogidijexoj.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xanolaxegusutekiz.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b23bc63a---79123810465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sample+answer+to+declaratory+judgment+complaintPDF 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_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 19948 bytes
SHA-256: fbb758f50e7ace3d24214f1551132eb163790ae757d7f752f6edf4a5c395d365
font_01_sfnt_off000145c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDA 11360 bytes
SHA-256: 4d11d061aaac179b0520fe0b4bc9499b6a3399a04967ea02d2d1ef76dc0fc11d

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