Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efcd2c041631c8f…

MALICIOUS

PDF

90.1 KB Created: 2021-08-18 18:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de68e63771fde9cb97de86a594ea9f71 SHA-1: 2e0eebc30429347bd88b13a005b282a91c46c92e SHA-256: 5efcd2c041631c8fccb11c94737e5dfb6aa22766b87afa953dbe3abca4a8f309
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute further malware or redirect users to phishing sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b08cca4a071---86812655174.pdf In PDF document text
    • http://thewellmanteam.com/userfiles/files/gusojapepexu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa6f90094---zobuxibe.pdfPDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e6761b9d7---pobilipu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0231a1478f90084458ca5374d7a9cc7a/jotuwimiwoxelozubudojewi.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210713121044625001x0o6crc8gegj.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/58526496194.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nomevelemapeto.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/82067042620.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/zokipomexebikomenosub.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/amk8gllb38sn0e2ovk1rb86i96/88058121401.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e863oc05s7c1q65t0onho1bp23/futuwit.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/98218530759.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/44845386919.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/t123v5qrnarmkn4odpkh2ub754/fujeten.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/56025942948.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096057a568fb---71719724032.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a3e75570---pudabusogul.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f2938c8b---lixotud.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/ganuvofexaserunaravajikax.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/88641852818.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/14139480626.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef6c1dc08---sunujasolorujona.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/11325164013.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/84275211957.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/92051852773.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a860709abfc64550b33044ac3cc7521/rupizutonab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=careers+for+disc+personality+types+cPDF 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_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10756 bytes
SHA-256: 1f19529b20b970dd27fcdddbdb792136f770629f6b4f1d799ef5ebe870d76f36
font_01_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 16208 bytes
SHA-256: 03ffc3e6090f93fa9073af80c89e244385766602eae017ff455830613b0e0834
font_02_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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