Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8bbbe0f092243…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 17:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db74a12c81fc5b1fa31a57e0a25eb449 SHA-1: 0d2038aaf27f808388e707f0800e4901cf759d6e SHA-256: bcf8bbbe0f09224304fbb699b890df68f019354986e16b60b8c4861f99f51afd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or distribution vector. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pixomot.ru/uplcv?utm_term=was+were+question+exercises+pdf PDF link annotation
    • http://packturf.fr/files/56935392705.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/34239315449.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/mutexojode.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/02d4612446d5645526e33ecb1b9020b4/41476920946.pdfIn PDF document text
    • https://aitalk.vn/upload/files/nekiwisinikeberilo.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/fowexokilef.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/daluwuz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdc43bcf4c---kokunapelidemozij.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/24262886353.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6bdkln2gbt5s84ooqc96pnju60/99159683773.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad8e21480---buposezegatabex.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616898c40c---97567625707.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/kasulagifiwuliduzedo.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/11892398238.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108161018393135.pdfIn PDF document text
    • http://chira-med.pl/pliki/tupimejagabisena.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210808184922.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4a5cf595c9fc14e01b25d9271e2aaeff/69450207569.pdfIn PDF document text
    • http://prestopc.it/upload/file/12778655308.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9bebc0f978e5903c59240f4a23c18ee8/22924077250.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/780e823ab91576462be9432a85a8b32b/49082942168.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/80766525248.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/43685761821.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/jibafinixa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/110e8c0cbe13d9e8b78b4563b0449ba0/98359967377.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/talumenupive.pdfIn PDF document text
    • https://polytex.de/sites/default/files/bibetigijisiz.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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 16564 bytes
SHA-256: 6c57c525dd0c79da277197d36fb908d5c45345951ec21987bef2dbc067ccfe67
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10992 bytes
SHA-256: a7d6c146c49e64bddffc5d28c3046c18fc097e27ea84756a9bd27c26eb0705bc
font_02_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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