Malicious PDF — malware analysis report

Static analysis result for SHA-256 084cb9d37f1314ad…

MALICIOUS

PDF

82.7 KB Created: 2021-07-20 12:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e4882ccffa36e943bb8141ba752dc8e SHA-1: f47217bb76e5424a38ba4d4da641486ff7d456ef SHA-256: 084cb9d37f1314adf0e90b4dc17e83ca32349ea62ac234306f7668cb270545d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://metallpress.info/files/51336417095.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b8cff01ee2082db5f4667fc7580745d7/paxekuxozasenexif.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/nhtiqoj6s2dt32o3abjjv18o37/guwodinixokawifoxos.pdfIn PDF document text
    • http://e-sportis.com/images/upload/39637581504.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/metataxotapitixuxupugapas.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v4cabgdt9ontfuirpucp3feoh6/58563585534.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210701212612.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/iisgrtc9ksj1nsrf3munnhrb5l/kovafebakuluxede.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7275dbc9b13dc1c65c2253dc9637f93/towiponulenigi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396c707a30---fipute.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608348c1c1f6b---99635511770.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/bufatipifitun.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160967c449c1cc---2068937686.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/21/file/20210521_160500_103.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5470e85a---34928234044.pdfIn PDF document text
    • http://tw-go.org/files/39740475723.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/doponipakola.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d12b398e25f89a8dd7fe78647416a4c7/12050741138.pdfIn PDF document text
    • http://babamoleskine.com/files/file/govaxememonoju.pdfIn PDF document text
    • https://visualarchive.bg/files/86343135598.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/80ktvl8th0n907fm16dlgq584p/87336509441.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/97183847345.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/zatun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+create+research+questionsPDF 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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 10604 bytes
SHA-256: 1250d8cf9f5671941743829e4c0037da24e4bc3cdc68495588bf5dee1b44e234
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 17136 bytes
SHA-256: 3437fa2ad0b0075d48a46daa6e1b8502c984dc2c17ef7c47531f76be031e005b

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