Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcba7bb4d4edd38e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 21:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9eaaa352ded6c781e7258063bbc80ad SHA-1: c6024c961bcb2f02cbc7a66dcebceef80e7fd6fe SHA-256: bcba7bb4d4edd38e99f7b0b8ea3f153aec25c96cc4d507334c6c5e921e607f79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised or disposable hosting, strongly suggests a phishing or SEO manipulation scheme. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wintec-samu.hu/uploads/files/34276911982.pdf In PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/30876096396.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/27163265284.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zepodepakakudagujoven.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vuziditagitivipenegomude.pdfIn PDF document text
    • http://ccshecea.org/upload/files/65828316040.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/s0m4642i8keq98v3f3grgv6f7o/90437365077.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xatoboxa.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1629272512598.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/zuxewubodejudi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8d7a6168---fojajuxarimifavebilafarun.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zuvixunefixefokanefo.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062423281641.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/56825959783.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/dusore.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gvfh2a5d7rof9enk9qc4adf7d1/41631168987.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ohp3f2i9761v26nanc01q0odt5/94748124814.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49299e48b30685b6e1c1bc0174a4fde6/82994623285.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gadevove.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/28698049450.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2d73416cbd3e6fec0aa62a3390d28d53/motedotarati.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/gawulukevofolik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=alkaloid+extraction+from+plants+pdfPDF 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_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 10956 bytes
SHA-256: f12503bdacf9b8b84f9f381eccda10bacd851b098842e1ca9f879193490bd967
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 18728 bytes
SHA-256: 8f54ec726df6ad5bd9beb56745499cf54071eeea3edff9ea4e1c738a73e7e34c
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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