Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1038a1f36675bc…

MALICIOUS

PDF

96.0 KB Created: 2021-09-21 23:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d19a320f90173264576167a0a740bf41 SHA-1: 7305d796f5919d14e85f0b13eb69e049fc88e30b SHA-256: cc1038a1f36675bc5106713e7c51cd178028798831323a88d31cfe2c5f791397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites or link farms, suggesting a phishing or redirection scheme. The PDF structure and embedded links are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=laoag+city+zip+code PDF link annotation
    • https://chambres-lannion.fr/userfiles/file/13296493000.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jutexowefot.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420899f31fd---murenilegelibetuju.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/7344800872.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/38812927835.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/20320634104.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/85962547841.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/nizajiserigexunuxa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d84e651bb0bc08a00167a02f1afc6fa7/85402661021.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/56802792522.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210913055019.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/xutizesapovo.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/femuledokojir.pdfIn PDF document text
    • http://gabortech.com/admin/file/33976300470.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/92147353009.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/58194743130.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/80942749726.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/dagowapinuneranofezuxo.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/88099670066.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b01043f0b---fituwalojonodudipemopef.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/91451104341.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d822681021---95542013791.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/rikik.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_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 17800 bytes
SHA-256: 2d8a068214b20ae952725650f792f753a9b8915a17b7655389079dfce0e8a054
font_01_sfnt_off00014292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA9 10404 bytes
SHA-256: cca052ab6cba9384fcd3aaf6014d5b3b4a105315b859b5a32b8c060b4c40c3d6