Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d40a4660427d9e…

MALICIOUS

PDF

80.5 KB Created: 2021-08-19 06:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d4eb9b5c1c077e487af47d73ebd666c SHA-1: 92d5fec5c5015c1eee2b3c65a93415e0d11abfdc SHA-256: 58d40a4660427d9edab4657e271ea6468b0d98f7ac56c30144c36e609293bd2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the URL structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://a2itsolutions.com/chop/multimedia/userfiles/file/sozegev.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96caf0b2b9---70482882691.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e74518a71---waroroki.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/19157331336.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/rakiv.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/fadadatefetoxuvasusodojur.pdfIn PDF document text
    • http://limoride.net/gallery/file/26065050445.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebb3737f0---dosotosaxejumapiguwug.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/tesugopefitujonugiw.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2a56021a7202e55858ba9b2dc83f5d40/2232640034.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/33199426847.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/8924717076.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a250f4b6f2a---rajamubuzeguzejibigusuxu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/konakijon.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vimuvugo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/eafda708fcde5085c2bd295845d6828c/41195092221.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pstn67jdbp82ns0i42h0bno0v6/lulamiwedimajopadone.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/18841643171.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/mufinuliwukitomiso.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xukufuxozelejelata.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/67086c204ce5535127068a986acd4057/66916250816.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/topoxodisuburikopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+calculate+machine+hour+costPDF 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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16688 bytes
SHA-256: 3a98f7bdaf35d56c6e7a856d595b1ad5d698bfd068af0a0e4bd9dadb7450f878
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10672 bytes
SHA-256: 40f509730a012ca99293cc21a618e57603fa7b1c8d58f6947788a1852fa844fd
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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