Malicious PDF — malware analysis report

Static analysis result for SHA-256 575984bc10c5ff30…

MALICIOUS

PDF

95.8 KB Created: 2021-10-11 04:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0412cb9c30567169e97a47caeef84209 SHA-1: b2ee4edebc38c44493e8b6f91a0c2fdb93d029a8 SHA-256: 575984bc10c5ff30974820a7ad113df7f8940f4c8dce71beb0a53eea1a72e628
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many hosted on compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the use of algorithmically generated URLs for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=the+astral+plane PDF link annotation
    • http://thuduchouse.vn/pics/file/kusafumulozajivasan.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/3325518363.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/jubosutafamitab.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613673fc469d9---34524367202.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b2b36ns6165s8h0kpj8fqqscr5/73619403554.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/37944823037.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/35552978223.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mizifoketalusuvagidefono.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/wejopulupofovawer.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/mamivuvivapomezolipawig.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/3851513517.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/45237158559.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/jufabiged.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/78812411519.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/83263265320.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/15045944616.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfe7f1625---62156854033.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/38871066757.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/653e5a967b28892676d28eb27cc8f67b/22053448259.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/mikurigapibixufiwamufinux.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/nikibezabuluveweveg.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/89580604923.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/desidulevuribefugisewap.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_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 21580 bytes
SHA-256: d36e9d4f6316b388aa384258a62fa4d83d667b7033bd01f11cb4e683f2f59d12
font_01_sfnt_off0001434e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 10100 bytes
SHA-256: d8379a896e83cbc4eb8f7b027782d75fe2af682cf724aca262c82b9535828aff
font_02_sfnt_off000159cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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