Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f71c5eaef423229…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 20:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac011a72217aafcb696f646d3f2760af SHA-1: bba930d2ad3c344b992d924adbf1275a9626dac9 SHA-256: 7f71c5eaef423229da8b188a76fe9997d875e7ae335d7857cfc445e696e0b80b
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://alhegazgroup.com/userfiles/file/tanetakuwaniga.pdf In PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/tusamumupor.pdfIn PDF document text
    • http://elsped.hu/files/file/20418509846.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/mevigeduxipag.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/95397336767.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/lotomome.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/wasixobumizitawede.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/61600118245.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/55838437018.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909035550.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/55100963506.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/4567acff6ca4f4f9ed7550c784f81315.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/bawubebetidibopebesikinix.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5362e199cc46c17889a071af26aaad44/rufivasomozezuzudi.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/24173298666.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134874a5769f---tamefagekekikuzilusi.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/semexotomasuzizepupirirom.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78a6bf2be---41535498616.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/sipakinemikub.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ca6a3690b016fb863a4bdc1d8507e2f/zonokupukatisomedoro.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/91888540648.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pijanelopi.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/88812259717.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/27559327375.pdfIn PDF document text
    • https://ahha.az/userfiles/file/gemosukawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cooking+academy+apkPDF 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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 10680 bytes
SHA-256: 5bbc03abea04959211e6d9aba78ec44abf3588d397a0eb9dc420d27549934f83
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 18320 bytes
SHA-256: 5002f576fb7b732e449412453b4a21c5919058894e5a715eeb730bce87b70a53
font_02_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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