Malicious PDF — malware analysis report

Static analysis result for SHA-256 4629319d79d4ae2c…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 16:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 43539eb50b9c3217d1ffd9975c1b617c SHA-1: 9296ee38f3ade341d6dd17746532e5cbaad77290 SHA-256: 4629319d79d4ae2c2bad354063ea2c47f7b61d914e44515e5dac11d031682630
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress sites and disposable hosting, ultimately leading to a PDF payload. The presence of multiple external URIs and IP literals suggests an attempt to obscure the final destination and deliver a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=select+mock+location+app+android PDF link annotation
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607866c5c172a---guzadowumad.pdfPDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2b76929f---20334943239.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1f3de61d6567eccc07a9cc86b5592757/nitelavusi.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/83102147274.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/vekodizabumasevudobel.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/neredosufas.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/abdcfb95a5f7ac56157ae0347279919b/83598537321.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/6542492457.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a323ed3a07e---pejanomimafo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b59a3e68a---mujixoxomisewumubon.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb43b6d0e---pudoxiwi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/fipexepabisobijolabo.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/44460174144.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/89392916765.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e29462f5b8661258d7ab3bc8ea14791f/76375165634.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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 17512 bytes
SHA-256: c3f82f2ccdaf132fbf70804fd4f834060d620f5e3c29e41b054a1577e00285de
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 10676 bytes
SHA-256: 826263c29ed0b7ffdbcd75049e15d930a4fcf2f4779ac8c166d9e15c649edc76

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