Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cacf1979d6cfab…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 22:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 363e31a919ac4d9ce24e7de6a0d05218 SHA-1: 216dab7186f24aa1876bf7b7cd591bc7fd104032 SHA-256: d1cacf1979d6cfabdbbab44b531842e90b5f0c89bc3d5caf8cd47c8b634bcd5b
156 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 compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613def09e76c9---23161389688.pdf In PDF document text
    • http://veewood.com/file_media/file_image/file/wukibuwaf.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/88467774448.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/jonejogixutef.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/godimufu.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210904_15BD8E441CC98138.pdfIn PDF document text
    • http://falconltd.pl/cache/file/xizuzufoguwavizefapaziwu.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/keramibe.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/jixak.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143640570994---68600395022.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109051208572787.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xedusiwofetonazavuvixiliw.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/70992006533.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/xerunotatuwejojawukar.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902060228626.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368757989d7---nogizubibimufebetomib.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/34253974490.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/65339066201.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8uqnsq6veb1vq707es8ojkiiis/84873653277.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/22735976901.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/naruwomululusawanevisukuv.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/sanijanidebemisaki.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613266001e228---15341370536.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/weloguroxulunijemav.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/89136685825.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cpkt7nos1ungtd0elp1eop4oee/88803040542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+code+to+check+touch+screenPDF 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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 10432 bytes
SHA-256: 13cbcbb1b3a10b8e7f383145109d7fcb1d76b1cc5b93546157ebdcb944b57607
font_02_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 17660 bytes
SHA-256: 0ee22177b5af27430d65216d9572142e39abb20895b8f01f16c52c35b9110d48