Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b3cc30428c718b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 04:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b17381d2fe0d472105321591c3111ff0 SHA-1: 8e9c3a1fac769101dff078961de3779136dabb2d SHA-256: e7b3cc30428c718bcbac556620808e72ed228857e393a89e1269b42c1db10356
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://unibox.lv/files/text/bupipozoru.pdf In PDF document text
    • https://alohasafaris.com/files/24188544725.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/xobat.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/4157502227.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313875ca250---20755916327.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/rugeso.pdfIn PDF document text
    • http://186086.com/upload/files/17934010527.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109070730068363.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/50088045410.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/89605367874.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/riniraxevo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b2ddd3b9---dotilikov.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///kikojuzojomugudag.pdfIn PDF document text
    • http://marketingnews.fr/images/file/wosumozit.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a7b26da03cbd6a5a4cff66fa15b7cdce/75978212862.pdfIn PDF document text
    • https://socardan.com/userfiles/files/wobidepikujebuxawawemi.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/vikifolukukomalisikefun.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/rerazag.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/76688344570.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/77887379704.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/pakapavejojanuvexoxuke.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109012145159176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rest+api+retrofitPDF 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_off0000bcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 16764 bytes
SHA-256: 04a5b45f94d4f587247608ef7cd6d11a4179b4e776d27376d9ac848553061f48
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 10248 bytes
SHA-256: 1b1d0e93518d7386a482db36cb37aa088cc374e102c46bcf0c305439067c253f