Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33fdb05b0698fb3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 16:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da9ee35fbeea99d1e2d8f8b7fca02f16 SHA-1: 6ddfefe4c725ba3cee14016710f9969b2e265abc SHA-256: e33fdb05b0698fb346fe1e7874008dd97833f0be2fd9dc639723c79107727911
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://banghetretruc.com/media/ftp/file/53184384248.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa1f76c0a---18981720594.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613004adcc0a1---99522235353.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/rufuvobumatere.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613682c29c106---35436717182.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd157c6c7f---pegudawuligafozami.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/zevekogot.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/xevemiwuzivezirorajikebe.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/suvedijewuwozilel.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/10241589621.pdfIn PDF document text
    • https://ocw.tw/uploads/files/83789867410.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/4515764463.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913094931.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/39154001395.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/jufugikejaderikotiworugo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/28199540477.pdfIn PDF document text
    • http://huefpdf.org/upload/file/delalorugedupovi.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/44757231668.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fewujexuzugojakasaso.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/femunipubune.pdfIn PDF document text
    • http://cbstav.cz/file/19470476295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+manual+car+games+for+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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 10972 bytes
SHA-256: 5c5f182c45378c06bb1c1b3de5f941809c807112c00fc08f8cfe03894a957fd1
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 17608 bytes
SHA-256: f3f4d8d6a6ababee8dbed6f019262bc4c4d0ab588766774db851847edc9bf801
font_02_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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