Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b6014e24363ab9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 13:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 970cb0ca751cf498b18c475fa2592b94 SHA-1: 47e3ba24f618446eaf6798e16561f7379ca5a586 SHA-256: 53b6014e24363ab965579287c817e68cbda3231d9050dbb90ae0f7203fb76f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs form a link farm, a common tactic for SEO poisoning or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to external, potentially malicious, content, aligning with phishing or malware distribution tactics.

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c38e322df---wuwin.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/94749026087.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/36193143768.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/13711368368.pdfIn PDF document text
    • http://klaaswester.nl/img/file/62851161027.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161048868efae1---48963710872.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/depup.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac170bcee50---xanegakerurevamawupav.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/44149127482.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/neromoxuxe.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/gaworitiralebigov.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/2410031137.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210822050102.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610399b75aea1---rijixajuluvakazunom.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/xelimizugi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6091116---mebegoxovadoki.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/gufapipovof.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/mebefoginatuvarafi.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/kadugisu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf871a90---jagon.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/18242817187.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27bcc96fde---lubimej.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/54149959752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=motivating+yourself+and+others+worksheetPDF 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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 11084 bytes
SHA-256: 3d393ef2642deaaef98f16febfe575c7e5b949c462fb0b34d0fbda5d8e5cd57e
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 18444 bytes
SHA-256: 6dd1e14528eb3aa96eb5146c1791d3892c84d786d7cbce8404eab1da081a3330
font_02_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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