Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdb62d6d884fa54…

MALICIOUS

PDF

90.3 KB Created: 2021-08-17 08:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f491feacb2dc61d0b93b807e11dde96 SHA-1: e7fae17bb719098c6d7928b2995fa7d9a3f4b19a SHA-256: 8bdb62d6d884fa549cc7773677a31db1fc8dc79c8e621cc95481b6371a9b6dc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern observed is the use of a document as a lure to drive traffic to potentially harmful sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=transitive+and+intransitive+verbs+worksheet+for+class+7 PDF link annotation
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ee3bbcb470ba853fb78624743628fde4/12858842399.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/15585664603.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/30316098331.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/bedutudupetuxufamigugix.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074aecc84e2c---82694169211.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fitodij.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ca9fdb95d0b422150854a315d86118ab/24733854241.pdfIn PDF document text
    • https://tomas-music.com/contents//files/nupazubukokumaguvaze.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c887c9a83ff---welik.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/50621830412.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/54097996882.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/kibukupikirixe.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/jozepuketof.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4609a66b5a---41602350112.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160853ee7beed0---77883059879.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f123afe721e---gidoxexakijuboxonefasekeg.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7k52kgc2ctn75f3g8qm6iehoh8/54724218397.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1404ca9ad0f689b54bae273b0c0cd985/pewonuxewumenuke.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6e95dcc993faec0825d2d9078dd7099c/16123439886.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/85816490814.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nukubefukijofuzedi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/061b808702e03cfa8aed3ca7db2a669b/9548938250.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/dubol.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_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10968 bytes
SHA-256: 492ec43a0ce7aac318e524678e59c32ccf38b7b6181c63bf886b9ede436fa3ec
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 17888 bytes
SHA-256: 40ad01f704b43d628fef35a08b21c3241f3ae3c748675e331722b10953487fef

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