Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a83adb742ca496…

MALICIOUS

PDF

96.9 KB Created: 2021-09-13 14:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6f6b70cc4d7fe829c7da556a934adc2 SHA-1: a877c062cbdfe8217e1f8ac6dbe53deb54c0ac8d SHA-256: f7a83adb742ca496a8419af29671b7b3b9dd448d00734ac7aaaa61b51503f889
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to trick users into clicking links that lead to malicious content, potentially exploiting embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://queure.ru/uplcv?utm_term=garageband+equivalent+for+android PDF link annotation
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/duwefidedifafofube.pdfIn PDF document text
    • http://artepcb.com/upload/files/84919030543.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gusolezitiwajotirodozam.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/forisojaxini.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/tibeveleraz.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eda9eae9---82028001857.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/24107317191.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133348a5d9e3---70176385652.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/zolagetuwovotud.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/40618846848.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/96312557999.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/76641004160.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/bubiributobupujawev.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/47892347885.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/1446095811.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/29049672899.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/da6030603721d2b4f0f201946bfc566d/xurunaki.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/40533761765.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/88357583069.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/kojesugakokifelalaromuve.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e02b5ac---zuxov.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/nelufularubumalixufa.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/88549427771.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/newulez.pdfIn PDF document text
    • 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_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 10852 bytes
SHA-256: b59df87c7190abb9279e49051f58b720b2f6f0f166a551ffd6b26c028370ba01
font_01_sfnt_off00012f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5C 17872 bytes
SHA-256: 3c579b951589b018ab3c81c8896a94c1e6f692ac4db8bcbbacdd1ef947238b50
font_02_sfnt_off00015d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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