Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4f3be658a1af52…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 04:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa7d8106456961dd7678133bb9e095be SHA-1: fa57d0ce53146e27bf376c3d9e4de1c4c881f6c1 SHA-256: cf4f3be658a1af52408b05603cbd5b06eb5a983843e48445be59e74c342daeb7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URI heuristics and link farm indicators points to a phishing lure, potentially disguised as a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=snapchat+dark+mode+apk PDF link annotation
    • http://symbioticlifetech.org/attfile/fckimg/file///20210905151021_579074188.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/feratojadaxa.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/80698435671.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kotanebekofakugosunole.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/23797835051.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8285adc6d1b180a83a97ff1e4cf5fee0/73610142893.pdfIn PDF document text
    • http://acelybio.com/upload/files/xikebefapojalifemavivose.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6516134749.pdfIn PDF document text
    • http://theponghop.com/upload/files/83585399114.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a896c4a03---vuxuniw.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wenaru.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/xitojenesovobokuximadove.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428817609c7---deragurebipasusubasage.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/gamanibasapijese.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/25600077831.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/vujokuwulodixusasibadaf.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9644e63a---85949126182.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418c21e49ca---87867261235.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/90166333519.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8c920c91---kozufumibi.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/73687920470.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jepolepemetupuvulunilepuv.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dupabuso.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631602451.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161419aa1b4f35---tonafipudepufaxadelarufeg.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/17440769252.pdfIn PDF document text
    • http://turnyras.lt/Files/file/22837333197.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 18740 bytes
SHA-256: 10277b2f62ffadce7d5579bf55d30809a5168554409fdfae0b53a2f363180f5b
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 10640 bytes
SHA-256: 061ea176f73685f3fb2712a1ad310f710ed13cab49971f6d3a70a284005159f2
font_02_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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