Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ab2061946101aa…

MALICIOUS

PDF

100.4 KB Created: 2021-08-10 04:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1e81f07148d69a138c55daaf83139c6 SHA-1: ec1f8bf5dc2a8f09582fe98ecff6ab21519f2e08 SHA-256: 71ab2061946101aa7d4b1c6e84d27fa82bae5406d32f80e1d5faf212216254a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://allycatering.com/userfiles/15761937679.pdf In PDF document text
    • http://energy-labels.com/userfiles/file/xonowekabijugozatutag.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7a5d35a49d57e41fb19d579d4c615a5c/matipuwitepebazuzosomuk.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/junowele.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08b1007cc---72781328654.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/38336541979.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f58effce---wujabimobemonupaju.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/059b7ae47c6564458bfb638ca77eb1ef/16752588306.pdfIn PDF document text
    • http://builderall.info/userfiles/file/tuwazedodo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/kekezudusodigawuwo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ni7qs01vl2ohbg8baaes6tfa9r/bazazapixoxezonaxasuz.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/sewekusipizabamogomiri.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809c45ed73f---68909237176.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/77369553624.pdfIn PDF document text
    • http://szpk.hu/_user/file/3017066654.pdfIn PDF document text
    • https://tmtteks.com/files/95546274687.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gibexexigotali.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/kokemilojuseralagusiseti.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/17irhbsa9ra6a7e7gg732mtqjn/65950939475.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3aa3f6801cd130a86eeecdf63e0eaed4/8651679913.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5e47d7ed6---48273141298.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/uhvq76h0af2i5t6bsfuef41ns2/32865010017.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/62276210459.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b78ccb7917a0b5786a4ab2d93ea0e33e/dujexuroxog.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f50c9bce96620dd27d04950c165d29e6/sepefopos.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/daponarefavoxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cambridge+checkpoint+maths+workbook+2+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 11492 bytes
SHA-256: f3e9320eea6e9e802bfdac623bcd5ba608b4b1d8365696492e232fe76eaccb55
font_01_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 16084 bytes
SHA-256: 86e84c66d8d6f41aa4fd4ca3112cd9676e96dc3ca2bc086eac79e8f8eb451e33
font_03_sfnt_off000150a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A9 18644 bytes
SHA-256: b5bd9b355ae6a9244290d5e1aca6dd7af649f8c8fa4ed12656f443bdda7a3e97

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