Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f86ae654c0cc9b…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 21:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef93737af3ed18d6e1a8bfa4ec2a3fe6 SHA-1: 24dddb33e528ac822e3b14979898a6305a4daac0 SHA-256: 15f86ae654c0cc9b0ce9aca63ae19b835e1a1c5bb39e40ab29f887ef32a2d683
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a high number of links to various domains, many of which appear to be compromised or disposable hosting. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into approving multi-factor authentication or entering one-time codes, consistent with credential harvesting. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the link farm and lure suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1309882d2---mesipugakex.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/pedovas.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f1b1f7a98394b126ecc31c928f602639/guvekukedawasa.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/semavavironidazo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/povuvivulufozoni.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/74859880370.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/85779735.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083904c4a67e---59235067032.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/lutijomuvivulovok.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d2717fe2b614a0f6eaa25157959b006/95843912425.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0995a16784e830da81531a59f5433d1f/12637729701.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vreooskevhdftsmar4i2ihe4a7/16292822907.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1e4bd2a8---rosigivemasoz.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949486e470b---34036396519.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/s76n9rmc6oi1tpk3uesgnv6uo3/90522720578.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7620669aa1---nenijiwopoxonevakin.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5691491df---84076748642.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/famukudakikurupixalas.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520174948729235bbn4hu.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/vidomelulesuxu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baff9998233---tewanuzilina.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/busedadupofurisuxon.pdfIn PDF document text
    • http://sns.hu/_user/file/kekiresixef.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zalimitigel.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/99818366969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=filling+a+pdf+form+in+adobePDF 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_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 10692 bytes
SHA-256: 659655f47c2ba0fa4330c0466de1dfc907077486d231643178aefc54f0116d8c
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 17208 bytes
SHA-256: 0fd1868782373c7a9b0865fbb0e527884d7ff0d17ff5156b239bc7a581df7193
font_02_sfnt_off00013d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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