Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a821b073c6b9e45…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b854e250445f9664017fbd91450dc64b SHA-1: 438fcf28ad63b7c87d9e3243110e0b75a8367ab1 SHA-256: 5a821b073c6b9e4513e362b9a6f7f2592382ff0e6bd606f941eb665d7b8f4a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=android+dns+not+working PDF link annotation
    • https://bientannamhuy.com/wp-content/uploads/files/lomuzot.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/vopubawexo.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xajud.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458c29ac580---lakafusamu.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/godak.pdfIn PDF document text
    • http://client.diffuse.info/files/83498997553.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/sijazofaf.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/nefukumozo.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109200842501396.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/70290954110.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/66575708417.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/nozete.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/94980698456.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/853e946401d7ca35d10b58d02eb71a99/wewomid.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/35323161367.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/tuguxifigagezot.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hddu1idode85i73she17se7op6/nezuna.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1653195cf---lapaz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6c0835a---72337504658.pdfIn PDF document text
    • https://congchung7.com/upload/file/99807918705.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/soxodelujozediw.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/26187308973.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/xakef.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/dumodabunupurubaguxuwobef.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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 10240 bytes
SHA-256: 6f021567cfcee371fcd0e5dce22291c80efb175b89b00aea73e5b316b002cfe5
font_01_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 17920 bytes
SHA-256: 8eae1f3878104e3b959d3c3798a6b378160afbd8507550369c6bae61aa095c02
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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