Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff07a2259bd2f32…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 17:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2e71a0d54ca4f7e6be2a1d77a9f1bc9 SHA-1: 049b66acd2c591d097bcdb0a9ebd45902c23f282 SHA-256: bff07a2259bd2f3296f5a8373dd08aaf25fd851f660b06f4b9d6748748eb2fa5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded links and the nature of the URLs suggest the document is intended to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://daulte.ch/ckfinder/userfiles/files/88912053299.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175ed452e7---rofibozodik.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/tekofowelelabojazo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba952ac0c---25891190483.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8704b8cd---baralepatimameta.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/65764284559.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/vegupopazufudo.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/popakurexalomivenikoluso.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/56841667820.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/xafekixilamuz.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/kobomemiwinesafoj.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/72696543210.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b7d4f57c---zevanejadavujamibixolibed.pdfIn PDF document text
    • https://jotelek.hu/files/file/pabulegefijijix.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/ritit.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/11066884158.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3fv8l08t45dg16lpa2u4qsm076/82399686.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d9315cc0cfa12cd343f2eb5a65c9eea6/zopidobaxaxirukedixu.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/33657194258.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/71024811864.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6fc46e43f---51673551081.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/2326776121.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/merikifogegewunifuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=worksheet+for+pre+nursery+englishPDF 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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 10776 bytes
SHA-256: cb4c8b2c28a32a1181c3df217c4f2cd004d7c0826bd874085a4a88de91ad88ab
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 16356 bytes
SHA-256: ff6047de8cca19e0c518e7f4babb8d7076acf72c0f8656a3ba542fdd7b75b41b
font_02_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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