Malicious PDF — malware analysis report

Static analysis result for SHA-256 0167e48ff09216af…

MALICIOUS

PDF

102.0 KB Created: 2021-07-03 10:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af169f053d125e254a1375fb1b1f4ae5 SHA-1: ad96937e95fea488f635a91bb1642f7773ed5e44 SHA-256: 0167e48ff09216afa1ad403c9128446d238137be89f9ede37e221781d9810024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, pointing to various external URLs, many of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the nature of the heuristics and the ClamAV detection suggest the PDF is designed to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3mr2phogo9arr35fmc94cnfa2j/munaxegebazejelof.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/1001542649.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/ganidokiwirovifukevoga.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qukq5pk2tqqgponck5d6bqud1l/wuxigokamanigovelus.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/27086128150.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/93342854597.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tijuv.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071493d7c527---16763828246.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/54116916291.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/07f5efc10400cf45481892fca2cacc3f/kegigogisevolupejereja.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5f97bfef---88368040387.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/direrugabibezuwarevaduxo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97489012c2---sotupebixirodomirewelupa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5ial7l5s6c177u365ke2o1l05/19487329011.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/58f62ac03d7a2bb663b6f1751fc72f44/tofodonadenizevove.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4de4325e---55385792863.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0cirsrif131nsfoookt0tmgmo1/37605108850.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/47400176091.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646ad9f6ba---ramoxuxam.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b5394b909e1cabe3dc46a9d4ef647b81/42808007334.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/99504152469.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620a37e8f1---reliduwodanemoz.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/minitobalupenid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=anderson+silva+weight+and+heightPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 27856 bytes
SHA-256: d6a31b6fd7da55c3f94734ebadb0f0f8f92d5454dbe315400701f64548844b09
font_01_sfnt_off0001442c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C43 10660 bytes
SHA-256: 8b3445d9c0c7726b072024503a70438755748d3bb4442a34762dc6db53c4bc3b
font_03_sfnt_off0001747d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747D 16368 bytes
SHA-256: 1957c7158e46d2a1fcea66bafa400ac9ebca94e16e515df6fcf3dbaa0e857b8b