Malicious PDF — malware analysis report

Static analysis result for SHA-256 7030ed9af218dbf2…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 23:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf4c42ed9f55a41158f437b3ac68038c SHA-1: 04de6284c38612fc70bb6387af66fb5d137159a1 SHA-256: 7030ed9af218dbf2100412e52245f8db6d7a90be950599a3c151bc0780d62a99
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to other PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/db5dc6b66c06adebcad0d8bb9eabd8d5/mekudawalovoso.pdf In PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/jufafapemovujun.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/822278768609bb5a2968ac.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/72260664529.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f48b37a0---dobesewipaji.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/4260d1e9f00ca8e43f7c58acf4c84880/32683715401.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082442ce8b24---fegaforeborakinimilak.pdfIn PDF document text
    • http://innotack.com/userfiles/files/mawupidunufovagadafas.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/10a9600190c504ed8fd73610b0c0e9e0/mofanolovafatekepa.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/26717221367.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/54061340613.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62798cc10e3e44388e0456b063c9aa86/13123109860.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/putopibefep.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/valokov.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/c3hemde0ihftbrov884oulgrk2/penuluvoludowu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a632c4bb1---bakoxikunulex.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096a8e3f1040---78715550014.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/18496266829.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/68835463042.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/2caa756c99adbaad2f75d1626c18f663/93941191259.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/dutaki.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/98255116761.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/7f491c353ae85b5ea479a9ff5541c543/vofutogedoxatitosadatagal.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/697401349.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/bolakagu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/kozaxunezuxuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rizzardo+trebbi+pdfPDF 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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 18220 bytes
SHA-256: c1ca3be8e4bb2bacfe63c06484ea368a640a190de885d9d95341cb2f0ab72c29
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 10420 bytes
SHA-256: ff2a076fdb04b33e5b8cecdee1a29e3e3f369e4dc1d1394d6fcff1f437254bab

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