Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf4af5f70b4799f…

MALICIOUS

PDF

90.5 KB Created: 2021-08-04 13:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e298ccc6a81011313dca3c556bc55e7 SHA-1: 20b91d948315a5d291a99fba7eedd0b14c87e519 SHA-256: 4cf4af5f70b4799f4dec137537ca63d456d92307cb6a28a89c5383058bfddb2c
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=home+budget+spreadsheet+template PDF link annotation
    • https://biomisszio.hu/tmp/80850283007.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/90820509231.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/39491583811.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/84634953159.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/pafegodidosimisijumupuga.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/vajuvanoludidiraragonipe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/peluxujixasugukepuxu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ca619a6dc76cb92b842d7e3de9e69d/xegupebofumovuzetitosom.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/1535160096.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/mizivasaxaxuridam.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e886a87d5c---xutawizajogegalup.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/62292982623.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/limojesewofijujukagoruvon.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ginam.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/luxevexuditivaba.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/roximituvofunavovotop.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5c2c305664d044c9e8513a0189ecdaf3/pinabokazesako.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b549d2c66---wezoruzitulefi.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/23585390710.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kevujimal.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/68254010106.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/972608eb1537f022c912caf005b7ede2/japurobubunobajebukasab.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4f986d1fc49efc23d519a768212cbd78/14995219570.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/mavumopajuvedejex.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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 10872 bytes
SHA-256: 468d5ee32ed78b917bb0668673e3272f5d8552738b31af5880e3bea10ad6d5f9
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16996 bytes
SHA-256: 394532662d09ea7fcea4b06a75cc4e8d580888d2faf20b0cdf3de1696755ec80

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