Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c85655e4d82954f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 05:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3f4f3025640912e114b024f2cdbdabdb SHA-1: d213751147f8b33d1551f9fd1abf6f405ac6c989 SHA-256: 8c85655e4d82954fa81e709769e8131c35fd66b0a033bda34ea31794524e94ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd0e94ed9---dokefoxalutomedigerulal.pdf In PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210921_4C9E3B998643363F.pdfIn PDF document text
    • https://kratky.eu/files/file/6815941106.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/fujugibomajiko.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xovavozotifaxevinina.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/jojibomefebefutedewixuwu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04b2c2b54---nugewejed.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/95931031258.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/radowatepitafi.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/pisotevivopin.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/50219055737.pdfIn PDF document text
    • http://e-district.org/userfiles/file/24905820489.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ok3b6a32ehf66avnv47353snu4/vebusuvonodeponojuwamo.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/78869218271.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/84556696840.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/55152987456.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/96384331263.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7d6db69d---sejoniwazaperena.pdfIn PDF document text
    • https://tavio.ru/files/file/43134749469.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/91510768724.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130cede0abe2---nasivulolevuzawi.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/20240723553.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fuxuxunali.pdfIn PDF document text
    • http://tano-cable.com/d/files/88448821068.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/pipatix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=alexander+empire+on+world+mapPDF link annotation
    • https://www.alamy.com/licenses-and-pricing/?v=1In PDF document text
    • https://www.alamy.com/stock-photo-map-of-the-divisioIn 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17536 bytes
SHA-256: 8a14f20851dbd181b772fdb993fea1729bae99df66605bb8bab8c735cf7fed20
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 10456 bytes
SHA-256: 871ad81386ee80ac858875eb88dc21499148124f832981fc809504482310ce2f
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1