Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a025e5237fdb11…

MALICIOUS

PDF

84.0 KB Created: 2021-08-17 04:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63baa947c1671094fc230c1287748947 SHA-1: 67aa46784aba0c17fd7975e29b16480a799402c4 SHA-256: 16a025e5237fdb1176159b1f8b0e2f0ac0b0d4bdcffae3bd75a02177b5d26f89
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. The heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/16627eae26ded86c5010e6143b7f7e36/zovovatabazewozalurefite.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/30176689327.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/zarijijademamowas.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b54896ca498---81081219822.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/74a8c9102a537c387eaaca1dfad31e80/94788502081.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/furigoze.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6uju2084nh7hqdh0o972tsist6/32503964559.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2e8dc23e1---99988170457.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/saxelivoponuvod.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/54577505736.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b16si22mek7pn0vj6g7m1818e5/wofoligevokip.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa46869d82---rajosaberevariro.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/bazexiga.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/60888216507.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/6141505693.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/13432435017.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/00faf1b5fc5e906a66cfa0de1d381f38/lezanakafirebofixebarogug.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97813168766.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/97f3afd169248c1ebc9be203c243bc68/84397300311.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0848154ec---puxora.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3ff66d4f---pupopisisametiru.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/jeritozejafew.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/gazipevufusowasurufof.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/97974586487.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8e6495b6dde87a6aa3e6de0c30937c58/60328015627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=war+of+empire+conquest+3v3+arena+mod+apkPDF 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 17448 bytes
SHA-256: 5ed893b8a012e42bb57f45c95734eb2e6773ca6a49ef5b8c30739e78ffb7bebd
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 11304 bytes
SHA-256: 4118ebeec6001a9f58f6bc67d89884e53916a1022423e156d79bc9e7947284f5

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