Malicious PDF — malware analysis report

Static analysis result for SHA-256 5586ff984c87d394…

MALICIOUS

PDF

95.0 KB Created: 2021-08-12 10:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c96615f3f196a01f65c317e9da2647e0 SHA-1: 31bf0d8c2206101b2d4a3704bf618fd5d1c2d355 SHA-256: 5586ff984c87d3944a242406caf4c88c05698fb9f0de9354de629f00fab8aa07
156 Risk Score

Malware Insights

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

The 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 numerous external URIs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://allytemp.ru/uplcv?utm_term=the+audio+ac3+not+supported PDF link annotation
    • http://elskenecologie.nl/files/27698388857.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xumokusotaxewepasanedi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3580c1b50---pobin.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/50c079c13177864f58e19560aa9268cd/88637686975.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dixuwudufojuxiburom.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/xolejenukogirawinaxut.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/94840049667.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/19775048751.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/25723300937.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/46869379494.pdfIn PDF document text
    • https://etadelloro.it/images/file/75092764021.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0b95676b---96506853506.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sivinen.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/ridavokugifemijomolada.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/gugebotokavevivikam.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d914f07d435---6729882430.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160799cb9d6d16---75414466387.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/88927701541.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/85103802057.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/numakobevutoxamuzikeniku.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/25170161162.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/66116399541.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/gutufekalikuxanoto.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa2652bd7---11420856670.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071895f6e2be---73690454552.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/52937982120.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/suroxijegezesozenosub.pdfIn PDF document text
    • 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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 18144 bytes
SHA-256: b1d23f4137d38568444a9db61a136626c20fe8e3b1355cf0b0f1c23042f4aaea
font_01_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8A 10800 bytes
SHA-256: 73ee71800bfad6e93f2436adc21065a0c1b0e57a577427ee0b887ddc510b93c5
font_03_sfnt_off0001585c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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