Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f43d32dff44dee8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 10:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c85acf8468b527e0b8e2774eb7f58a12 SHA-1: 38674d6c042e0f5854027d59cb34e817bf9aea98 SHA-256: 7f43d32dff44dee869888f7961e95b8a0d12cfba8d603524c59fc9a413ccca02
164 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 other PDFs hosted on compromised websites, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic and ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thetestmag.com/userfiles/files/petebarupizij.pdf In PDF document text
    • http://nadafashionbelt.com/Uploads/file/wawufenivitajujanedaze.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/xubap.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/75150429345.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/kisuzuj.pdfIn PDF document text
    • http://watch62.ru/files/files/22288016221.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/winuxofikepinim.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/48656827640.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/vuxurebiveguj.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614762862eee7---poxobozunefekuxetoka.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a63n2dhhsl87oj3mnos6i5kea4/satubagixevuvapufawuto.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/tebisepurejubexepewoli.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/88138772075.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6cc450e12---62532908003.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/59752674692.pdfIn PDF document text
    • http://gestioniarmatoriali.it/37880741917.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/81819663710.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/raxavunojepilozimulab.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/jawulelorusizus.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rc7a0788bbdabsbb8h6f6isk9q/49109536160.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/dopewepujixekebamiv.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/nibekekiwan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+redeem+code+generatorPDF 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 10476 bytes
SHA-256: 339ae092c159ef9f87b3308e53efc789f7a3685dfa8a5e46fc15b636aa509443
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 18144 bytes
SHA-256: dfefbafc2356b333b5ecc157df4473fd1f6ac2ee867ccc83290388d7d47d726c

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