Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaa697e9a971b53…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 12:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4eb3c79c0219e62dbea806b677bd9374 SHA-1: 75e692cfe94c3cc1aa1138bf2b5f512f93552dca SHA-256: bbaa697e9a971b5331ebe6c440f118008ced59aba4c77be00c62a56a7ea02daa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL findings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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 http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/uie0c47dv78u93fon5ffa4j77j/pitowig.pdf In PDF document text
    • http://optikametuje.cz/userfiles/file/saker.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cbee75b6696720eae7c29a311ae021a7/30895360953.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/19945746181.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1d760686---gevorelib.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ede1f1d93db---dufelakitovabugik.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/baxomiwaxatisaxi.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/83782069491.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kiwovosuwuman.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4856563a903ada180b73a04ae1a0aada/88249395193.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8625be7ae1---fojosatumukatoridixavola.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5cf4a5837092653f28943b6a2fc06f1f/83597336796.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/47776166711.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b5d06969---jedobagin.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/bovamipoxanuso.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/54798126624.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/03882fd4f0f6925ebf83a5e3ebbc7c37/pogogobegoradebijijatub.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f214b8867e---57823704806.pdfIn PDF document text
    • https://agatanorek.com/files/file/gubibapevivilewurale.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0b9291c2---80925552573.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/94559103766.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/40271108cc2495c9bfd8399475309b3b/jololezusifavujajiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=veritas+gmat+reading+comprehension+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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10992 bytes
SHA-256: 0ab1b802e353e24fcb72edfee9c615a90baa724a18f890356fdaee0e777920aa
font_01_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 18452 bytes
SHA-256: b562ff837d330b48740a2891d7799b34939ef8fadeaf66fb72ee8a234f516c16
font_02_sfnt_off00013d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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