Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7805212fb94d7d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 22:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee15e51dbdb75c029f0f9e81be99dc34 SHA-1: a2b41b0735b8457136404ec2ab9c6e9e3c807b29 SHA-256: ac7805212fb94d7d059ce0e5a76363c41aa416e4264a33b0e471be600fd0ae84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=viviendo+mi+vida+pdf PDF link annotation
    • http://31kouqiang.com/userfiles/file/1630808184.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/kobutebugopujisoz.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/fitidil.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/rokirapufojazuzepexapuda.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/wewibabalebuxisotojefumot.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/logulixibu.pdfIn PDF document text
    • https://mmszke.hu/files/file/xozumutotufirasutetijiten.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/56308268400.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd6k7ifmuji8lvj6dsflobjntd/losusunazidajisegiwuxepi.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81512094201.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zadefuvarenezikumoxidabaz.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/42396894982.pdfIn PDF document text
    • https://tempegaring.com/contents//files/zogudedegebepazi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/gakovejili.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870543ee8a4---86546174451.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xeravajupiwoxem.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160865b3e1fdd4---junirowofipu.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/72322498017.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/resami.pdfIn PDF document text
    • http://deauville.ru/files/file/wedikokako.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607088ed517c1---32999697036.pdfIn PDF document text
    • http://a-pluset.com/userfiles/3639646029.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bll77kjag7adoc3a3skar07365/lodatapileze.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/84582912363.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c6c3cfd9277095e2c6027e9fb8fe15aa/bozobogonem.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_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 10280 bytes
SHA-256: 85937bd55fd473e15f4791d1658c1cf19a9aa8c90b0a1f39ae1b6f48852f622d
font_01_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 18280 bytes
SHA-256: e0f6185f12d61eda8ad7bdf4c42eb7aca7d86cbe5e413d067f57c46b27aca51a

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