Malicious PDF — malware analysis report

Static analysis result for SHA-256 77049c5d74a7adba…

MALICIOUS

PDF

92.9 KB Created: 2021-08-07 20:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b47d899bc9a0388a03382e048c1db04b SHA-1: 0e65258e8ba8684423d1a549a5842ce4adec98da SHA-256: 77049c5d74a7adbaa764dd742c2d08562fd9f75a0bf0f8b236e09d1b56a2cabe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5f15132e12a25c1710d2beb7439ce13d/63330596179.pdf In PDF document text
    • http://cdmatik.com/uploads/file/loguvelu.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/39598504806.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/6502077497.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/jejizi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160828c7e04ece---90770476231.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/85696654278.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1a35bdbb---74786094547.pdfIn PDF document text
    • http://hidropro.hu/upload/89998348846.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c47b319b---3183367134.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/5478927677.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e28588b8f21---65976873294.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dagifuzud.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb2496103---ruzowuduputuma.pdfIn PDF document text
    • https://olterus.info/contents//files/34532467397.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/47494082898.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/01aa54c7068824e4fd91ddf50917b0e0/lesijixisazetijutaxopiv.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/ximad.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xerubesazigutalenid.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/11232590682.pdfIn PDF document text
    • https://soechi.com/userfiles/file/63312812410.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/suzenerekiwatij.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kiwokusowopimixizij.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d7a2813bcdbbe353024cab8990609375/zavifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=where+can+i+buy+a+2021+calendarPDF 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_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 17460 bytes
SHA-256: eb9fe1e1e025e1e29bbe8420d66a9c4145be5e14b1d14f0455cc1b385ce2efa2
font_01_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAA 10724 bytes
SHA-256: d410acbff644102877334e7953dcf332701e4e987e20aa1ebee3f7e0c7e75464

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