Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c1cb1eee5d5e81…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 17:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc01eb48ef23c1d148bbd65c7924f919 SHA-1: 5ce75f3d13fcb5cc6b504e42384f6d3707c15054 SHA-256: 74c1cb1eee5d5e81d04403aa871a4d5bca8c002529ea7c0f0484c5223eb35971
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious phishing content. The critical 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's intent to solicit sensitive recovery phrases or private keys. Numerous external URLs are present, many hosted on compromised or disposable domains, suggesting a phishing campaign aimed at harvesting credentials or cryptocurrency wallet information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://medvor.ru/uplcv?utm_term=toast+wallet+mac PDF link annotation
    • http://royalgroup.at/tmp/mopoxofimis.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/84796557859.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vebubedarod.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/77529700950.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/37455863043.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/setotidipokowel.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/38487496046.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/47542868489.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/90202232118.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xedoxozibuxe.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/zamikigo.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2ed8102a9a659a90fa3c179227281b3b/31296624617.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/xuvagofixixozubu.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/batapidisaje.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce24e9514---78243222221.pdfIn PDF document text
    • http://ledins.lv/cms/file/dunisisegudel.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2c164aa27bd679838c2ba913bda7d868/4483666663.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/gokabovibavejivagenogoz.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/wixalejeweg.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/91541124938.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/56731955020.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/30166811469.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10144 bytes
SHA-256: 4f029eef3e497d4fb30960c3c717e055c161ee37eaad0262a7881d621debb06d
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 18444 bytes
SHA-256: daf4817713a0902aaa22043978b90ce2b904a677e87f2b841157df9918e74261

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