Malicious PDF — malware analysis report

Static analysis result for SHA-256 9503ace2bde9cad3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 17:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6013cbe64f4a01021d5945ce6996c22b SHA-1: e4a0e79ff79cfdd9d6bc727f613132014d85b9ef SHA-256: 9503ace2bde9cad3c2542516c6c69268c7d5dbd21e227fb1311933792e6302e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the heuristics point towards a phishing or redirection attack.

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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6ed876eb---kugenevewisilitixusolek.pdf In PDF document text
    • https://satellietgroep.nl/userfiles/files/38432267527.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bizivejegitosaxu.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tunadodezabojatewazumosex.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/lorekabenubiveputoritul.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/1785809198.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/fezoxojomisuvapu.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/23120690927.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd51cfd7f---73961260071.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9e5a3b9f956497703742519eafb5d383/41164282128.pdfIn PDF document text
    • http://vladekoservis.ru/files/gajarowojepubujiju.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/lalewotaleteperakunuki.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nutevevuwusepeze.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/19777804783.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/73687920470.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/61579748105.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/767c1851f630f6b9258e43cc4d55bb2e/telebumete.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613205ed4c804---80182466051.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/13076065444.pdfIn PDF document text
    • http://hueide.com/upload/files/99303023703.pdfIn PDF document text
    • https://red-adlay.com/upload/files/rebokabubuf.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/kejexofikiwaz.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/puzobogalidaxerivepeferi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/59665773939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=back+wars+mod+apkPDF 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_off0000bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 10432 bytes
SHA-256: 0836f05a30895c7762dec42811515e8cbecdb1bdf6bd175bd671e0be4a57542a
font_01_sfnt_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16292 bytes
SHA-256: 54c8711cb336b6ba42ce8300ce877126464c75c5f7ca2f1f705f17dde8747bed

Open this report in the interactive analyzer, or submit your own file for analysis.