Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb248c5966b1ab98…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 10:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48fd2980e559b0596b48ccf9f87af193 SHA-1: 5e9535ef7f6a67f12f52fa2db734f2c7101ac2ad SHA-256: fb248c5966b1ab984c271f97c69a77c8c2846af8c99882486e7ff3dac48311b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bushregenerators.com/userfiles/files/vusidebezimirojudud.pdf In PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/89279553708.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r3hgsjikkilnetog2qt1uf00ke/34497631444.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2d551fb5eb98d67ccf36c844eade8def/zitomawikewitipim.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/betipozerixasipidarikex.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zulenorerorawomipoka.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e919d08036---guwutew.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/piwet.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pejaxux.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/94045973503.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/ruwoxevuku.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/jumudililaza.pdfIn PDF document text
    • http://plncse.hu/php_data/file/89618254346.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/25576224866.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/muvurejonipu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/fupifopibapokuduragog.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/37576303774.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/51554795993.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/58560634043.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/25507493917.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/lorufujekinosonezoj.pdfIn PDF document text
    • http://inspeq.eu/public/files/38801597401.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/56441081326.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/liwunajitarusepezineteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=open+about+phone+in+settingsPDF 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_off0000c52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52B 15968 bytes
SHA-256: 480f159137b722737ebea0a357b3c45888f527f3ba53ddf417afeee1f12a0c04
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10648 bytes
SHA-256: 6cef80af61397c3de5147893c26d76cf7b8ada53fcb2522b5c80f7f3b92ef06c
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1