Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58d5bcb3142756e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 01:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b5df19c1b83b80afa4e27fc13f1285b SHA-1: b1d8e31396e7e29048d40f3c1d205b2b77c0b42f SHA-256: d58d5bcb3142756e4f50f186671ec54beaaeb30bc1470d52493edafaca527c1f
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=download+fifa+18+obb PDF link annotation
    • http://caramelitos.sk/files/67283440069.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/14061794155.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gewavowanamenifuvemelu.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210922234504_t8cciy.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191154887769.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/46cb4bdb3b2018d29c209ec877f38c42/viboki.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/67931620590.pdfIn PDF document text
    • http://asvpp.fr/pdf/vumenibisejujezililuzowo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/72879133028.pdfIn PDF document text
    • http://ipceurope.com/assets/file/50082574504.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7c2424fdf---68094847579.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109270011471851.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jogaxenogemun.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/dorudiwik.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210913_180736_3290.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210909020756.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/sunanitadefip.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c249ea4---10937127716.pdfIn PDF document text
    • http://storemisr.com/uploads/files/9514270448.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/kabotila.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/42715477826.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/fasefepokuf.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_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 10336 bytes
SHA-256: 208017823fa9793aa026ab8acc0335d08b526680daaac8a29f765b6f0f545a9f
font_01_sfnt_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 16588 bytes
SHA-256: 8596a3900386a621dd07b2e9c6b9a1b3da036efd86631eba8e6d23cde0301c06
font_02_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1