Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cdb2a97d51214b…

MALICIOUS

PDF

77.6 KB Created: 2021-06-24 02:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c098bf48596fc12c7aa669bc0602c400 SHA-1: 5bb825ad72339cc78d841024bb665eabcea464d9 SHA-256: f9cdb2a97d51214b28859e96b7b9961e6e0412003b3a84443a6a0f3b06d85780
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document that contains multiple links to compromised websites, some of which are hosted on disposable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ao+spine+manual+free+download PDF link annotation
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l2h2m531thvsoff06i36t2lj0c/61695533275.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160704926b967a---sukebilefadizepuzewutix.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qd33hig0iq6qv3jh8jnljhc6ct/75158039073.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/18140285209.pdfIn PDF document text
    • https://educhina.mn/editor/files/vogonolanojufejewatefo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/lf8v71qlu9pgsilk5aib8n3sk6/godokajewifoxenokaw.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/6749810933.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/bokixajalones.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/69068697430.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f5ed151---56814085432.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860a7992b00---judobikenij.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/55002128553.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e691a85e---88036435625.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/069f9496d4bc4165af086529b1775b22/33953634622.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xetujasuluvidapo.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/88c24873d939d3a6143b96b581b6d28e/liwovovuwibin.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a996ab6f521---xopaxebotuzukimijusade.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ne617bscqoahpoal7qfga8pd31/pakugivez.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/nasosimaworavatuvenunulan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 5268 bytes
SHA-256: d70252fae5e088457621bf9f769ee99bddaac3845df4933e5c196362cda99d2f
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 11260 bytes
SHA-256: 2f205eb36e56c5b4185001eee77481d11e8dff4ab34674b970ee9bc88e577ba5
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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