Malicious PDF — malware analysis report

Static analysis result for SHA-256 195b8cf81591a4c8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 19:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b03f2a188e14e027aa6047f7761185f SHA-1: 0b1d4dd1abec11f6c3c456cf0552b62ec9528565 SHA-256: 195b8cf81591a4c8b782e1e28c586fa9027f60326025da6f321dd3ada6c282de
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. No scripts were extracted, but the overall structure points to a delivery mechanism for other threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2554c9b0a---39459052638.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q5h7v06p34lq1fm10q1f40e425/50987057064.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/eca1932d57a1fe917cc94928cde84182/39083117986.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072165ebe7dd---57452690474.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/lezafidinoralusilemu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7fdcfca4f8b82c628d335499f7f9b05c/84658206729.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c3fde16675adab879ade11e6682a6f4a/65347584008.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sesimuwutuve.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210809182612_1015919962.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ebf98dc9f94b560c77d6f5d76f24194/66866730628.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/83335984272.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/08969a80c7f9bd65093197f8707c42cd/xedawiniwupazi.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/xorikelogesuj.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c78a8ab84699177740211a30f93a9607/bugedetaliroder.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5162bc91d1---vigevudixogumegu.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/3047733846.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/59770817851.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/jinijipopavil.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/46966621573.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/1502900694.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3fdef367752cd52f4bb035398a978e09/96107285862.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8pqumd402jfbgm16m46h2231j8/32823294454.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/jowuvimewufademelabemuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=left+displaced+abomasum+pdfPDF 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_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 18764 bytes
SHA-256: 8fed8b680d93efe2d75dcbd6e3d0749c62748bda03c8b1edadca215c810702f3
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 10772 bytes
SHA-256: fb930b374ddb8a1af6b8699fc4fe0f10e9661204d6d3dada3390c8f451463714

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