Malicious PDF — malware analysis report

Static analysis result for SHA-256 796c852c5c6fa2b8…

MALICIOUS

PDF

93.4 KB Created: 2021-08-08 23:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0191111bcf54c9182136f85ef34fed8d SHA-1: 2949053651f9f1bf63b7ed9c7702b2b7cba104f2 SHA-256: 796c852c5c6fa2b88676eb8d455090128b18b50308bbe243cc21482c230627e8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, many pointing to compromised WordPress sites, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document likely attempts to trick users into changing payment details. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=deutsch+aktuell+1+kapitel+6+answer+key PDF link annotation
    • http://slp70.com/clients/873855/File/78897855940.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/rupigamalifumi.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/86959332719.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/27503d4a3d41d370ff1153219cd3561a/23491998163.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cqk0unk56ujtchjjfn4m6qgo2/namixiwamekegopobesesu.pdfIn PDF document text
    • https://strechybenesov.cz/content/jubajatina.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/57719864894.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/31948976437.pdfIn PDF document text
    • http://yoron.net/up/files/letapetajojinosaxovalata.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/86031344718.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/sanalekufipabeluzasika.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/88550565358.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/binatuwusozutibesusejun.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/91890167676.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/zekomebiriboranar.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/75853620984.pdfIn PDF document text
    • https://veljun-ldm.hr/files/rodiw.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/molibedebewewoxibisuka.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f517ef2c0---vavodatumolodujawov.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/26acd9dce9250928b87ca51d6dfaedfc/jiradumejekez.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/eijal57ja3rpvkmftgs8of6d0q/57228384634.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_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 18084 bytes
SHA-256: 4138d38318833f9f714ca63e3fae004684e41a76daffa64ac19671b168b4424c
font_02_sfnt_off00014d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8A 10964 bytes
SHA-256: 09eae72d0ec5b2d48f1d6e28c142220ec6c74b2e3aa63cd846b603c934665464

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