Malicious PDF — malware analysis report

Static analysis result for SHA-256 3557d85f1cb0b07a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 20:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0074973e0cf3d8f9a267fb4646b67b94 SHA-1: a53c07225ba2ef4c6e6a4c9b0c7190780cbb4607 SHA-256: 3557d85f1cb0b07a2e6e8ccb397f295c0c98f276253e05a3787244f897a8ce9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action, designed to trick users into interacting with an external URL. The document links to multiple compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://locktactyuma.com/userfiles/file/pixabo.pdf In PDF document text
    • https://pacpartner.net/images_client/imagesfile/bakevusirofenemedid.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce8c9a6473---69643677498.pdfIn PDF document text
    • https://rais.bg/uploads/file/vifowenikeletinefupigulo.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/25752848130.pdfIn PDF document text
    • https://ever-progress.com/upload/files/gaxorad.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/57142098749.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/gamevuxa.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/51869703007.pdfIn PDF document text
    • http://clerus.hu/files/file/29963360417.pdfIn PDF document text
    • http://dsagco.com/Upload/file/tawisiv.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/32185725300.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/duzebebapar.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/tenixekaxa.pdfPDF link annotation
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6bce63f411be01a8a5743603b46918c3/favuva.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/82190922885.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613761e39179d---45478920594.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/93702487192.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/62190452776.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed844695c7---58549576850.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332afe36d10---dupuwinifeluzuledagu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8ae3f3476---22696930256.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/74013247528.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tupap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=good+football+streaming+sitesPDF 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_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 10876 bytes
SHA-256: 7852c381cedb32e3ac115274a5ae95d00dc7528be382b8f9ffa38a9d41cb73bc
font_01_sfnt_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 14004 bytes
SHA-256: 8daca8cd9863c73105d266364dc811cb58616564f1983c92d136df68345f2e87
font_02_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1