Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd74f45cfddc6204…

MALICIOUS

PDF

112.1 KB Created: 2021-09-01 02:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96e8c41e0f211014d2fd90206020e646 SHA-1: cf0b6e9ad528fdcb230bda79558fd9f0ac508d97 SHA-256: fd74f45cfddc6204aa7a6b339690af62c462901e7409d92c0d8e29d7f6dc5b5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://atenngo.com/admin/sites/site/documents/lixepejanunubuxunoziwiv.pdf In PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zubej.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/boledurewo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kirosixusimavowu.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/57293225058.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612a15e50dbe4---mevujevutojevexemive.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/tuzivasufowik.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902176036c4---70833877219.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cksg9lpj5m05d90lp7mnhpfo2m/25980788128.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/62096682661.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210626094342.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/visixewopawitimafepiku.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/10656571061.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080710081573.pdfIn PDF document text
    • http://asustainable.com/global/file/nopowamepolopurumek.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c843096b8b---19132712003.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/jizutav.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/45975513550.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afced87c92---61991150071.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/704e35b03013cffd858493283bb6cbf3/woxuzafizopukitojigudixod.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/mujisezajuruliw.pdfIn PDF document text
    • http://livilgirls.com/files/dozesadax.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/38821153057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mappila+song+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EF 10336 bytes
SHA-256: 6675a5d6f8ef4c6fd794f6471e86bcc4388ae1a2f98f0649acd22d25ba4f3870
font_02_sfnt_off00017c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C14 20712 bytes
SHA-256: 696ce4d9ea5a34a75a04add040f812b37b5a143aee75e20504297ddfc4ec9e9c