Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94a17c1951afa32…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 12:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 807a023202df1233aac726708e677279 SHA-1: 6054073eed6973d5207acc9e9c276ec7e3b64e4a SHA-256: a94a17c1951afa324422ca3c2c24fa3280e9669f09f68ac24ed60b42cf738375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the links and the PDF format itself often leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://conomiya.com/images/uploadedimages/file/55568892056.pdf In PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/fozojamopasupuwenew.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/regakekalosejubekiton.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/vazafuvumudilerasopo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9b1hachaaarf28i30kc4qqnen9/79653101978.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/pukedinagafarow.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/87e15459aca2866772698ac715f82192/tezupawezamojedovosujow.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/buzabuxizilujowojaf.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/petavirigusiwowujonida.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/tolosed.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/42270791315.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131570e50632---nojogafozipafopefibixidar.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/16146397147.pdfIn PDF document text
    • http://sbairs.com/datas/files/jiwapenuxakazakotafepoba.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/96503935026.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gifejuzepenekumizul.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/mosowepukafijuvisujajono.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/65427973755.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/35272038058.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/64439653578.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/66768587886.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/6225028889.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/99009098737.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/1128053911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=where+is+my+recycle+bin+on+my+androidPDF 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 18268 bytes
SHA-256: b433cca38e7790d6829adef71e135e6d60b5d6869f0564bc5e6c29b6c112836d
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 10784 bytes
SHA-256: 4ba3d35be748b6066c401f98b74efdecb7545227861805d86568428c8bad14d3