Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e81dc619ad1080c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 03:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba26a42892b671ce164d3b868723215a SHA-1: b554f6ae36067efd61b084d91d7caf64667c138f SHA-256: 2e81dc619ad1080c88690672486f153f28c2c9d1c0e7f285603767652ea0630c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, many of which are compromised WordPress uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=flow+free+game+download+apk PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5rkonvdtn4nh53jj3r0088d1io/vavinudipoxelekujaxe.pdfIn PDF document text
    • http://minipit.com/data/files/60870639896.pdfIn PDF document text
    • https://congchung7.vn/upload/file/wuvelelajowi.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904133857479931.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kefuwemapowopoko.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/13a87bbd03d699da2b8e2d5b47b5f38e/pixajevame.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/31943531947.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/17067086430.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd4f94ba2---depefusadama.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/mumofakemupakadavipopujij.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161357dff28af3---26518283228.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/xesapazuritira.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210908/16310761375724.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/20916776210.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912130213.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/83837848488.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/37735212930.pdfIn PDF document text
    • http://fourfoods.com/images/files/17788303755.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/19412641233.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/40394308827.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/mipifoxavaripubifawulipuj.pdfIn PDF document text
    • http://devveb.net/userfiles/file/tuvinimevig.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/1757422699.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zetox.pdfIn PDF document text
    • 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_off0000c4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10640 bytes
SHA-256: ace75a0aec48bcf7c5c1773fb522551a4b4e57eb727d8a65f4caaa61bcdd7166
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 17048 bytes
SHA-256: 98288753721b36460eb243ef05069674dc963bc622ee412e3b01e9f48328bd7b

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