Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e654b7951b555e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 21:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63e4a11313b78d3ab925d09e85e2cb08 SHA-1: 6f8e5a3e732e6afae5be967f909fefa2e5955396 SHA-256: b7e654b7951b555ec7e3c2fe734efdeaa2fa0513618405cce7eef562f573697e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to other malicious files. The presence of numerous unknown URLs further supports its role as a distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e5fb6962---lajuwumituparu.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8035fcbafc49ead13b9fe027974147ae/zivifamogeluzerox.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd4b6c473---55547013544.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/numexizadesuvus.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/rakiridoxuboriza.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/86750370329.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/mitudeni.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/kofukigava.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/47370742306.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/63e8h1ja9kdqrv9bcesjbt0jks/51008347542.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/11305854921.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021082608511193.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/53995799841.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16129661498b18---49570183107.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f10e90860---fejeriwodebanug.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e358c5a69---6916985396.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/40322517348.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/76331173580.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/mijazomomebavopijegek.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/18108402064.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf7172485---nexawosarosujadesakeziju.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8caec0823---pelebubiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=touch+screen+based+home+automation+system+project+report+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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 11284 bytes
SHA-256: 76251ddb72063c45caced6be4f610d6d02329eb0fa419cf707af24981df084aa
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 17020 bytes
SHA-256: e6cb560fbc5adf6beaf2df6dff80715db94d204a308eec688bd72ac73b7c1f48

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