Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82c5034d51a600c…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 07:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60dd771a088213c19ed23c5048f3a5c0 SHA-1: 6cb50317782fa8ba629f21c67919b61c9ff56905 SHA-256: f82c5034d51a600c5928869e6af14dada0ef402e80c8e88218519d77b7c2dc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://philabc.ru/uplcv?utm_term=why+is+my+danby+wine+cooler+beeping PDF link annotation
    • http://dafangtour.com/fckeditor/userimages/file/luriwologataxugepun.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/jugononoba.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/58005148181.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a8e79ffd---17483109208.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/15828083389.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/toxivixirogafoso.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4c85831d08931e17f0f7434de200166a/labutumakumuvax.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/77066eac73e1493a89246394f8e9196e/53080399881.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922e365f42---kimubepasidote.pdfIn PDF document text
    • http://mopron.ru/upload/files/94032748934.pdfIn PDF document text
    • https://csn-alliance.com/data/files/lelikosami.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/52055473402.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/96707323764.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40384930980.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623192845.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/93242686210.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/23b3e5af6dcb9a3e4aa0a86bef60f7ae/93347000719.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e258a6f1e---wuxolinatidazorinivi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/20435144816.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/85821041137.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/24ff525813f55e8412e0bd12bfcbfd5e/3825407831.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/54055814391.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/60624517128.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 11196 bytes
SHA-256: e8e3443b0220aeb720f68277ba1c73ef4f5f6fd1309cf14d6b6ab045d8d74b8b
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 18924 bytes
SHA-256: f6975ea2491bdecb9341de460ad7235617b01c42f3dd2cb00f048a5444918997
font_02_sfnt_off00013bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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