Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa6e2210527590f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 20:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f764b8ec2cf905f3841d7271b71fcf3a SHA-1: dd6352fe979fa98def9694c9c96b736513e10a09 SHA-256: 2aa6e2210527590f7ff47ee306c12cd81365f85c02395786d561bff995cead73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=vertigo+and+stroke PDF link annotation
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zifofapufirobogob.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3835c97ce210c7ddd934c0467e0d0c98/57640056283.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d746263c2c---kokamed.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/serarodulebosizazamo.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fajuzaxevobejuneto.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/pojunar.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/51194965011.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11514312384.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/41146809798.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d4a468f18291787812fc69f80632b8ff/piwarifalupejijox.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/alg4q3urq51iu2s6n4o0c8mqa7/kerowujowudomukorufew.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dasakaderinilajepakiru.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sawetulijo.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/88617870051.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/pemupiwixepogilosi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1ef2086e860b302f3e02d810fb5c8e5/27177129582.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/85287731276.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/jotufixukisomejuv.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/83787633944.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/65831533100.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/17776043032.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/75774186469.pdfIn PDF document text
    • https://csn-alliance.com/data/files/64266369203.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/vigirib.pdfIn PDF document text
    • http://maxbrio.kr/files/files/2108664438.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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10440 bytes
SHA-256: 92ec364c4f34d1322b80a2340d8215ac1b9efe04c5bac9b3c646f16456a4290b
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16264 bytes
SHA-256: c8e29511a7eab6ddf243970617dc45d184d064d7cf00e3567cb3b3b2d7ebadaa
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1