Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d99b5ddd953b6…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 17:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 47c71874a70305708d648f9a7d431740 SHA-1: cbba0fafa568c71e77a88764a57ffb6f43ae0f05 SHA-256: 8a5d99b5ddd953b61ae888513d034caf204c5d6b8ba2f1120fee5043497e32e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable hosting and compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=final+fantasy+15+multiplayer PDF link annotation
    • http://sb-78.ru/files/file/mazejizetidemulevo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77839890438.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qtev0qjc53agd1lkks3aof4ga/97148449690.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3ffb98f3---57387156977.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/4154671325.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/294rj8l8oq8ik0td2ei8c82si4/58113253120.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xusewu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5ff52964dd---junisugaxolox.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8d3afa52f11195856989115af6c69ae/89120368382.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/3556239515.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/23589932508.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/mua3d8t4jnlps783hgbhv4s4v1/xedipabasuziziluratuzoja.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a13e3ddf---rovuxuruxitovewo.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/wuvisujugep.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fa8180bac67e8a3c26311c8b4535be0a/43704342573.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/24ce5b84d33613aea854726f744d35c2/suzilu.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b9bbbede---gafekix.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/bimewupekojudim.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jubovarowupenobok.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/253a0e9379288a49280e9bc878abf25f/rolezitajesokokegeninu.pdfIn PDF document text
    • http://brlairport.com/images/file/16066794655.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/jewufaraxorupelipad.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/348992d9d597a9fd0145b031b8843d38/jabazivenosajuwigub.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 10776 bytes
SHA-256: b1dd48d786e40b4aa3831c627ef4985b45804154d3a88083287f4be538eca9f4
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 4932 bytes
SHA-256: 6d1349c8c9eb9a608f54fd5552d45dfb0667579a9a7ad521d940d8e22a22aa7e
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 19692 bytes
SHA-256: a4cf9932982886ea81210475d248b8a177e7930a13c71bda3eac46513eba4fb9
font_03_sfnt_off00014e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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