Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6335780c409eada…

MALICIOUS

PDF

70.5 KB Created: 2021-07-03 23:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e56b18bd775dd68fc6b96bd058c72f0 SHA-1: 64980e8b11be81d8f6b27575ce38fafabfa52725 SHA-256: e6335780c409eadab200ea3f383ba64f654141fa9e73c51f611b3762c718fdac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely designed to trick users into downloading a payload or visiting a malicious website. The presence of numerous external URLs, many hosted on compromised CMS platforms, strongly suggests a phishing campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it functions as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=electromagnetic+field+theory+fundamentals+guru+solution+manual PDF link annotation
    • http://myblindz.com/fck_user_files/file/xorimuwexobane.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/ketijepefujetox.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/ranigap.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f1c9d473---15281761781.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c55d07aa---59391578087.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082909c221ab---77336585507.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56078929d---semuve.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/butuxufawujaz.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/48012600872.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ac117901cf1cc254f917826084c7f48b/lakuxilubawokegemabimuma.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c888726a4f---zunuraxafuzeka.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e11f7ed0a---xujakixasogiriwat.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4f24878a---favoranivepejakopofu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1be2f7fc---76682705046.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sijumemodap.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4u4tobu4fppt3gp3kr6609ane0/zaxobipefiw.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e1489531---14408817389.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/semowewiragid.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1676d20b6437deed70dff4b270b7fa65/waxuvi.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/65167788490.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af56d385f---nemetusewonidejapufa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/893e9b2368746ec8e59652d62a117430/vajuma.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/pg4etk7ir8gve3ra8o3ba6mpp0/xadija.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v1tlfbotou6291ltp5uv2pe4ra/88087206790.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d569f97c---pinijarifosawu.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_off0000b895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB895 11120 bytes
SHA-256: c4bd293375c43f6dc1f7c99a671590fc93a8a951a325e3e17647c74d99478ee4
font_01_sfnt_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 13712 bytes
SHA-256: 4bb45d6eecd6078f4a99b31eca12c32157a76ffd747cfcd90fd6ae067d00fd7a
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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