Malicious PDF — malware analysis report

Static analysis result for SHA-256 c847f7d860f52240…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 16:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca8b55b1b50ed6e6c152497ff524b6de SHA-1: 940897808f59e840312b2f83b7cb23ce9943e438 SHA-256: c847f7d860f522400d6b208df3b3d48feac9c59e7d6154c44c1d9747f16f6a90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

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 https://chcial.ru/uplcv?utm_term=when+will+my+hero+academia+season+5+be+released PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf76cc9ae---61340965957.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/23158599425.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/85463674700.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109132013086441.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/99876659211.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/3748089026.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ca899ae188400fcc3239e25800d969cb/79900399971.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/tafozofenuxevusebugafa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386fb248a02---97972684440.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/20524091051.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/73522346076.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/17799822715.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pepozitoruwitafijuko.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/bimojitavolevatarab.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/99795932512.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/gapub.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5b193acc0a1a74eba9de040ad1ccc809/kurelufiwudasodewagav.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/sewesizumati.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/dodefubusi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f374af1e---kilegunoruji.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a0of21scfutkg32nttvvm3htsb/30267760779.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/46951432056.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/78071995956.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fuvigenafogojerixes.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_off0000b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 11004 bytes
SHA-256: 4406045588f42338a2251734e1f8329e6cc12547539d3bd2c4a97378c1e2c42d
font_01_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 16656 bytes
SHA-256: 555e98d7742af50384ce00b253555ab24b0295ed809c30bff01e65293c7df3c9

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