Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdf2b729f401a96…

MALICIOUS

PDF

87.4 KB Created: 2021-08-10 22:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d626ff760c3d04e21b3cc761261bc48f SHA-1: d2907f4fbea66c703c71e024137b5504191c27aa SHA-256: abdf2b729f401a96ee13405f3f35e26e00c8741df3c339bb6164fcaad7bff916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://infrive.ru/uplcv?utm_term=super+smash+flash+2+shadow+the+hedgehog PDF link annotation
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/b6f262113cbe128986fb1a5cb1269aaa/11523277165.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/51798843374.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf1a5a3cc4---43180845876.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d78baa404---46686001416.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/benukosilisetuzavon.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28cd17dcb911c029f307cb89d937881d/keduseneverew.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/41143553698.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0ff5237728b4c3757376bc11d7653be4/48652383140.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/midupofepibelar.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/12449381247.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b756c7cb7e2---wedatururadoge.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/99154584048.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b225d7892db---83211935211.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nukawizaxusunera.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vkcfkrvulav8mhsik8qktr7h57/jovilugatevitebizex.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/34442639300.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f157545fa1587841b1da2355f05fe94a/gojeso.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogegop.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da69064f46---fesajewenewapiw.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1beb80ecb3---wodunorupamadubelonaxoki.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8092a6059---50769090471.pdfIn PDF document text
    • http://jar-ted.pl/file/67735465980.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_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 17204 bytes
SHA-256: be7a87218a47a00879a3a62d871c5af2e4e78d98b59f8f1efa3b9f0fd808b652
font_02_sfnt_off000136bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 11128 bytes
SHA-256: 14a46d965ea2dc386d74dbde74cb68d666ce76a6c4e9eb1d4eb1bf1f399fe252

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