Malicious PDF — malware analysis report

Static analysis result for SHA-256 431f7cc468bfbc32…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 16:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89ecd7656844f3b194e8e718e2247e58 SHA-1: a54b59a5f492dcc4c43999a21b9365bdb6cb61df SHA-256: 431f7cc468bfbc328a79fda14248ca1f2017402bd1641799c6b87af6fbaf1d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://selispin.com/calisma2/files/uploads/68835448078.pdf In PDF document text
    • http://csc0311.com/userfiles/file/20210727235804_8omkui.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1367d80f---nujedelowudazijijiwag.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/1289569865.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/81192720961.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/86fgr9vhb0o7ejfakon12d1jk57r97tv/xaxobukemewilozuxivaba.pdfIn PDF document text
    • http://biomisszio.hu/tmp/kirolijik.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210705165555.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49593600105.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076440800797---15915012224.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/37127c67d7356f819110d00886d2d873/tozadaravog.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071711f8350c---turuworesifofuxotuxuner.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/wuvivi.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/21851988562.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/sodimama.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/poobth7rs047mo2lvcds9r3l0n/varevibibulevezivaluduki.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6c9ebe63c---xafatebivinerosos.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0ca96eb0e3b1e604ada866c53b511914/zutizeda.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/tojifizagasidexidi.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lraaaeriuk19h37qu5gh0ifjg3/xuvidudalinepigipejo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wosurejezusawutesuvu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4cb7d83e7a442671a0a886d901c2d6f5/16764390170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=l%27imp%C3%A9ratif+en+francais+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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 21216 bytes
SHA-256: f55837ce535a2262149cd17b61dfae83cef9c4ff8096c092d44ed2374b3493f6
font_02_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 10760 bytes
SHA-256: 4ea29ab6c26830db09aaebc2259e894e06d0b6fd122b687154f89c44a52e6fd6

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