Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc4a3616102390d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 18:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71db438959d9d28bc18e881bad5bce2e SHA-1: 5700555ff1ee2c165bfaac71090b1fc4b6dedc0a SHA-256: abc4a3616102390d388962e56d5a13def4e898341d14ea14c175db1489156f2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further indicates a lure to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and URL findings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=sapiens+a+brief+history+of+humankind+ebook+free+download PDF link annotation
    • https://muzpony.de/obrazki/file/19337805882.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/kasuwafe.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/92727851864.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/84776802379.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/49193860865.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f91dba1385e9300265f818f74302858a/zivotitamoza.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613332b20d822---guzomekafexej.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161480cc3a1796---fimawiwagitefazazuka.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/7629736922.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gupewuxeregojir.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/43602913445.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/katoropufopog.pdfIn PDF document text
    • http://melabo.com/upload/files/86540197374.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/36352819651.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/xexibokijubixudo.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/29012755599.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461dfbd63b1---wigewowobixifemagijixere.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/61684713582.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/32868002804.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kinojokepotunuripu.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/zowagasetirafapikunilat.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/vafufavisolisalu.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/4849860310.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/15316967829.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_off0000c062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC062 17112 bytes
SHA-256: 32fbd784f92c49c605645cd22660c52f2f8fae8a775c22805e9e0df09862e590
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 11372 bytes
SHA-256: bfa5cf37fb229d21cecf2291772f3cb9bac5b320ed0f67f6883160a6436c80d6
font_02_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.