Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec22818eaea51c59…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 00:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a1017aae9c565e1ed0aeeaed7e52145 SHA-1: 6b7469a59ab0b0a10c2546e07a002e9ee79788e1 SHA-256: ec22818eaea51c593f92f1e6bd5e59ac5a13d0ca4bec307b7f6becd241ccc9c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://bawwabatrizq.com/userfiles/file/pabomo.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/45788528184.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/81813421206.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/66add14b1d942b3d42b297554a0807ad/xetupixomonadanizixufol.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/letado.pdfIn PDF document text
    • http://edgecs.net/documents/58432934718.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210720_163048.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/12887795301.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/33374588630.pdfIn PDF document text
    • https://isleo.com/i_photos/file/boloj.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108310618461852.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/lodilogamiduguxiwif.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/xazaxok.pdfIn PDF document text
    • https://ratosatu.com/contents/files/38722231144.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a165787f95e---97938648013.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/58795623865.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f031cd9c---mimazojeki.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/wunigefapepoxunis.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/84313457079.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/8838341445.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc7c6286a---dagazipeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=options+trading+education+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_off0000c081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC081 16996 bytes
SHA-256: 8e84f5b42d10c3ab52924d15831a1a7142a98863e7158ba578491a4e67be2f5e
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10872 bytes
SHA-256: a83fe5b0146aa5bb30a4da6910ad2ee8bab716b8d3596da7b9a1df10a58ca55b