Malicious PDF — malware analysis report

Static analysis result for SHA-256 757b418e8aa59c6b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 13:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56cc1a4510d5242d7e5eac563a157584 SHA-1: 4f1924c64ef7dcd0c6e3cc8efe34a1bba8d6c7e5 SHA-256: 757b418e8aa59c6bed5f81704f3b473cec9180f833a11d47b362a07c07b5e0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://netshopnepal.com/userfiles/file/newasuto.pdf In PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/31834352438.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b37fa1da3---gebimopelitodinevejajigus.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e3a7376de---55488986227.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/404e49ea2512df0806f809f65704c003/fopivivu.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/46391115914.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/sowamimuzumetuwemujo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0eb3uep7mdm8s9e1obc647r7j7/junoduwavokiwelizafo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449c44e69e7---xekexapozivupap.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/mixixunosolosekivoti.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/99573069212.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/95569929544.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/defudexupumakuzalimasase.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/43548572904.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/kenepakaguxodoradabas.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/49191730461.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/pizaviben.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/sivizora.pdfIn PDF document text
    • http://philipsphotographystudio.com/wezuselivuzejepamurifu.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/bagokibapulakes.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/98451273895.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/17409967601.pdfIn PDF document text
    • http://chayka-svg.ru/files/83733238166.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/39911875164.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/kirowaxovividifuxu.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/sadagudonizotozoxoledefek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=emerald+rom+cheatsPDF 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_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10424 bytes
SHA-256: 1a885f127e2f232bbdd1f5b326a9561f13387be069455cfa5750551271eb1759
font_02_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 19168 bytes
SHA-256: 89b1905f88a77bb14e2d607a42291023edcea2cda7ddf9f38badf056fb30eff1

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