Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42a242ab2db1b85…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 16:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c0d42905056f41952ba04716dfd6086 SHA-1: a2b21ff9f9a8473813e0e94f8f44a7a6539b0298 SHA-256: e42a242ab2db1b856ae6cff5621e4e5ac30569374a97a79098e08cc53782fc17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, possibly for downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://holcom-wd.holcom.vn/webroot/img/files/23924703993.pdf In PDF document text
    • http://daeryuhealthcare.com/ckupload/files/87741795374.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9b562378fbf8ad2cfd55051346ac3a99/98999314754.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/10694869053.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/76895421058.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109072353453933.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/58423865695.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/dabotuwafuteporetigojewer.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/51496981565.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349717ac782---5781341581.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/wiwopokamufaminoxuxenoko.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xilujupunorexozegasi.pdfIn PDF document text
    • http://hiniceshine.com/upload/63987478540.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/zozuboxikepoguguxus.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba4e32433---datibabelegokusizuruvi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/004083638779b3533d0c03218048f4c2/nameditetufodamuj.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1ep1622trns5p2dpn621a7jt41/lolelewozub.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/jiked.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210902130933402728271.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/83026837685.pdfIn PDF document text
    • http://techmechengineers.com/uploads/mupatadewepasuf.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/resuwavonorixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+sa+mobile+download+androidPDF 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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 15452 bytes
SHA-256: 94fe2e06410d9111874af336c29e01542620d015794c3319aa41b687e533a5a6
font_01_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10676 bytes
SHA-256: f38e368588bc43cf7cf19f841695698d70d96aaa1ceee15cedae0871f5b94cc7

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