Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41d61aa17f06619…

MALICIOUS

PDF

77.7 KB Created: 2021-10-03 05:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3dfe5653b2c14a4982f16c97a61e0354 SHA-1: a9f721514bf08299eca660e7f3a467fb7df9d82f SHA-256: a41d61aa17f06619cc48f258173ddad278ca00cfc58cda13aefa84ad07b4ea12
156 Risk Score

Malware Insights

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

This PDF 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, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs reinforces the suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 https://darkoyunpin.com/calisma2/files/uploads/kogozaletetunikagojis.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/litufukorefa.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/16945066784.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/51099503693.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/2706346406.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109200849236025.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/20994788940.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/22432785921.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/guriweluna.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/31387597095.pdfIn PDF document text
    • http://partiaweb.com/upload/files/lazef.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/89865453048.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/labuweno.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/besawitomovinisugoma.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a04cb420---17536159848.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/81858720925.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb58febb2c---bijatanapuwagifut.pdfIn PDF document text
    • http://topflexsports.com/uploads/diziwolonufiz.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/56707287211.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/ditagerivizuxotunixalokeb.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e50116d5---wametetidorijesejamir.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/galubo.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/52214660147.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/71535835720.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/77263583930.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/22246081166.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/83192760340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=country+guitar+scales+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 11040 bytes
SHA-256: 0f237c281b8b09443866518842122ebc17b1c2eef4b09f6f9be4aed5981d1d36
font_01_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 17184 bytes
SHA-256: 019e767a564351a2f7d1ca20b2adacc596fab9843fc45cebc834138ea0274d8e

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