Malicious PDF — malware analysis report

Static analysis result for SHA-256 d374b33f2d23ebad…

MALICIOUS

PDF

80.4 KB Created: 2021-08-18 02:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ae4a40add58446a0b102969f4ac50b3 SHA-1: 593d9a169cb2a841913c9d993d5507ff8f7f7285 SHA-256: d374b33f2d23ebad324e61f0164342d308e6fef86a741bba1b25c9f80a32b0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

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://pistant.ru/uplcv?utm_term=levenspiel+chemical+reaction+engineering+solution+pdf PDF link annotation
    • https://marljivo.hr/UserFiles/files/38326391560.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/tezokotujejofe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7d693315ea81393bbe118ead52923a5a/tekosetadipukobugu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b037725892d---17631271464.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6mb9irjb5ndo7ggeoc0gfoh793/97190186086.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/75883040877.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/af06e37acc60c39214e96f966b53c10c/64160357264.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/20338284039.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3c53092931b843c0fa3738db402d36c8/pirupumuratikututufujiwik.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qpaks564hclgq1j9e7unvubmk4/77349423523.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6c04b4620634473b590a69ffa9368e48/21808679656.pdfIn PDF document text
    • https://aspirans.com/files/file/kunomeratimolabokajugus.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/l7iu48v7j2cg4el13o10mkvsh3/42675042236.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/71616524625.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/99107566586.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6471428101---82611787586.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/86k4qu8jv7is5l3b1198qh35q3/56953196141.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/juzugetefazafofajir.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/faveba.pdfIn PDF document text
    • https://kaimano.it/file/laferiwawimilu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/goguwidulatumugiduporiwi.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/gudawamifuponef.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kejaxunu.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/piwake.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/53860490634.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_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 17344 bytes
SHA-256: d6b8ccbf16dd132042dce63e3c5e1be5f6bdfc3f3ad2a34403792606d0e490c8
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 11188 bytes
SHA-256: 6dc42ac0eeaa85141c5d866e8b810022b6b6737cbd8fb94977d3fb5fd7405587
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1