Malicious PDF — malware analysis report

Static analysis result for SHA-256 674195ec1ea4b3b9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 00:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4dbf9c0bd8676397a50ef4062e6236c SHA-1: 3470a81e90b67df82bc996f4d33039442114c215 SHA-256: 674195ec1ea4b3b967c9f077921f2cff142f8b43962287ef1d055b3ef1ce6767
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://domholidays.com/userfiles/file/xoxebafufowesa.pdf In PDF document text
    • http://bona-agra.pl/Upload/file/bamuzojupekilaziwon.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/44046207438.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160880335d9a6a---59389590582.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/23778373584.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/57139003968.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/21645782765.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/taroberam.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/45963033716.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/relezaxetusi.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/jegamipeluvu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/eg73m2vdfs6ghaju8bclmn9l4u/80142220940.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/kulixavowubivokobet.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/81892609010.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/dc33ead933721bb72f5035edda69b53d/7741813531.pdfIn PDF document text
    • http://superpart.com/files/wusidemizutifuwijuxuz.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/pizafavad.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5udnvspjd94c06e0faav2ndge3/46760932883.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/24715903015.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5567d2f43---vunowozewebedalokasawopab.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e838f8a4---favifi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84437e133---rusotunipurulivipixamim.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3d7f8f249d6a9c4db7fb62087541fbb7/kefitosavavub.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/p7nt5dt20jfl502mlgdeg1qkti/60538168482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=h20+well+drillingPDF 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_off0000b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16220 bytes
SHA-256: ed8175d19dde60d6418e2577dbe350deb7df0fe21e58d3b9c1675e3c5b671107
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 10192 bytes
SHA-256: d8f4fa91bb533dd31ccb545bef79cc6e2f5d4463a2cf34346d8ea52b49c2cbf7

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