Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9aa948c6238854a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 14:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba14625b349b4f109c2a19401e54670f SHA-1: b897d0aaf7453fa3f1f3a3ebac22c0d18cdc8130 SHA-256: e9aa948c6238854a43243f740f5ec0c4444c5069685d0dd4db63ccef4b363f77
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites. Heuristics indicate it functions as a link farm, likely for SEO poisoning or to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://imi.vc/upload/files/lobuxesujige.pdf In PDF document text
    • http://lg-palette.com/upload/files/47488929197.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9b0116ab06d1d0cdf212ae061b73c216/piwirajinakemuvazawa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mipeminowapogekazele.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/tizepuxi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91ce33a37---gowatelopezimovugatamizir.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/tikoleronux.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/40777399090.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xojeroborozidilopalupafe.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/vijaregu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c310f03ca3859c2c1dde9dc933ec96d7/29565268113.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b3ccf4ca28c3654c551994e5cb49b55/35117758587.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/banibiwas.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/98538500382.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/19785061048.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1fb7e8e0---683572008.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kuleruzekal.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/xedobizerigomiku.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///45385467232.pdfIn PDF document text
    • https://hsse.cl/files/denerotidewabo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/47391170266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=correlative+conjunctions+examples+pdfPDF 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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 11208 bytes
SHA-256: 77fa97e90782a0c515e0b200440ff79cfedb8514c988e767c21bf5090c921db2
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 18564 bytes
SHA-256: a2a22042a3a317abb59c701a7498f0e40611c1e67de54ada4b86ae139ac52705