Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d6da66601b0ee9…

MALICIOUS

PDF

110.4 KB Created: 2021-09-08 04:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a8c373f87adfa61629f43a4da1e4cd5 SHA-1: 3f7c4f5ad6a7746b2af31bd1fa7e1c5bd463a1f4 SHA-256: 09d6da66601b0ee9a84385c90826265772422268a9f78d3534e85ba900222154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The presence of external URIs and link farm heuristics suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a19cb9deccc---33812962763.pdf In PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/jepowoteposeraxawoluzaben.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4f0a5c88---vuguveritef.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3db6b0cd4db1f08c1626f1174e09c62f/37691273679.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/72884140781.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/48804961671.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/gejonusebevoka.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/54465017390.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082246cda888---58825834537.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/fagiwifogarij.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/nunakubazidu.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/56453615280.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/17674495321.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/47676652047.pdfIn PDF document text
    • https://carlojans.com/cms/file/ripatuxemewabuguposom.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/cbda8f391a34529cf460419118a69766/towebisevodarikimokemebux.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/91210216728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gripping+gaap+pdf+free+downloadPDF 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_off000148bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 10532 bytes
SHA-256: 5ee2d092249f616be5358542016538beaf53b27dd0c46fdba2c4bc1e4d757e42
font_01_sfnt_off000160ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BD 19716 bytes
SHA-256: ea19642fb655b85c634743c4cd7fd63c68306d4b6168d42031835df9cd084d87

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