Malicious PDF — malware analysis report

Static analysis result for SHA-256 278b07d4f10fe037…

MALICIOUS

PDF

67.4 KB Created: 2021-06-19 02:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 55fdfb5f8ee0e849361c5a960e6d733b SHA-1: 671ce2c8181e3f0624512d556967e40bec6b20de SHA-256: 278b07d4f10fe037d92048c63bda51c0eca3194f2299771282e6c531f60b981c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of numerous links and the nature of the detected malware suggest an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/569ad0406ae1afb9dcebeb8f0192391b/redobawapisigokusajixa.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/82699003cdaf2f816fa56a81c4252758/xemakotupakunajukil.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607351c948539---mazupesedodemenefati.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eejdfijp3tc8gosgvsbdjqe0p1/8624795792.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105241012511909.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ea73f2b2---keromejuzog.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/82f246ee452100589aa84e3b0548a81c/kamorowavamefa.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/20241d5c9a5000abfa92479264d3a684/48959340982.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4aeeca7872bd638f207ab18e1b56c41d/60971543057.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/931d6bpdn4hprc5tvbfs89eno5/49767195521.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd22e10f2---mofodekara.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff196cc586---nigupomexorimenoneso.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2af8526b54---45196048237.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40a38cdbd42fdeb081ab0bacc0761a2f/vixuzevika.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/93789661808.pdfIn PDF document text
    • http://efrex.cz/files/file/10113997777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=scroll+to+element+in+seleniumPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA21 4720 bytes
SHA-256: b888b1cbc88b89fbfb355b742abbff9913bb67e8d0aa8f54642de31f06cd33f6
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 12472 bytes
SHA-256: f4e893c3e263771e3eb036e72144760816ff94ca5cc85ca403c44aed9bd4d8b9
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.