Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e48e211b87ec46…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 20:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3fc1864f46d9252966d10ce6ca029f8 SHA-1: 0bfbed2d80e195ac13c9a8f2aa44cc45739b53d6 SHA-256: d3e48e211b87ec465da214011440028035124c3739c24a629673d564c8877fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were directly extracted, the presence of numerous external URIs and the overall detection pattern indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://galaxytraining.examinationonline.com/files/61659407466.pdf In PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/30590085552.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0c2af3fcf11fdf441b2ebfd5903ecc20/toxidekelelazuwatuk.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/foted.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/87877153690.pdfIn PDF document text
    • http://pneusmarene.it/images/file/18401456106.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea4fcf0f2---tesubuxedipizedaxif.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/wevujunesoxaxovefi.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/tazawupezusijewizatuki.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9ad6e3985b7f591f672b1a6a26d299d0/39788293430.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/lowevopinijafezo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/galoferewa.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xofupakegilodutet.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vixatexogepawu.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109180501595795.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/sijezosu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148066f26d47---14766826028.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a4ca53f29da48c0c7ad6e5b212742a50/9525469375.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zotire.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/56296628646.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/77589916198.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/1087005362.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/35642606707.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/33516320285.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/54608089613821821d55a.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/43566949722.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109101204097707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+call+of+duty+mobile+latest+version+apkPDF 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_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 11380 bytes
SHA-256: 72814111235f77937f12aca61381bffb66636edbc9843180620b384c411ff9a5
font_02_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 19252 bytes
SHA-256: 1369acb70b090cd1994a0e4efe2205790f62716b0acd68f6f3c2ba65ff9bf5f9