Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e51eae57c10e70d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 02:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 710ba88840159966cd2a0c3060b3ee5e SHA-1: 43883677e8f9a878fb27a0daf60f4619bae18991 SHA-256: 3e51eae57c10e70d83ab462a92b68770c8cdf981c1cfee8fb17f169755bbaf1b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sakuragiramenandsushi.com/uploads/files/7018272189.pdf In PDF document text
    • http://smartdeal.pl/files/upload/files/65484950940.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/19460167338.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435b4de12bf---duroporokepopadinuxuvi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf208e0f7---85387791922.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/oanfdcsdg0bn9lut74h9tetr4l/zijoxuserewupej.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/23428495696.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/41792592879.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/vuturofoz.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/21248009702.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/4225255610.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edb867051---nesubexademobuwure.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wazemokezuguzenawasiwofuz.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910181020.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1af1bd4233d62f3d5d85df4b5d5b44aa/zifegubatogela.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/kuvawise.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16ad6c326edbd0ac30e677e076f57524/bedifapidokele.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/duwaku.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/45063477082.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/40212244924.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a8bae6e3a0173f6ede95b536754e1dd2/ziwefinabefurapobuzi.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/96426702451.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n2umfsb3gctisdkpg507kpvi64/wexaguxarun.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109101544122332.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/pesuvapojevopanubevu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1ad1b2de---nevog.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6b29c4d5---xipoterago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shareit+versi+4.0+androidPDF 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_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 17472 bytes
SHA-256: c40ea6574135722e28d48d83313dbff171c021f890179aa327695155dfdde652
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10704 bytes
SHA-256: 9d522690fce924fa2afe76e583f64d9a044e4fd0347f13dcfa23a10d88b5876f
font_02_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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