Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba4802e1b738528…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 03:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b34132343444d97d40225008ec3d8145 SHA-1: 0e281a35698f0d201685ebf60e5b0d03078cd465 SHA-256: 9ba4802e1b7385280f90b5f602525f0dbfa02b9548b8809bae9a5bf086b94c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pistant.ru/uplcv?utm_term=research+about+cramming PDF link annotation
    • http://phaptangpgvn.net/app/webroot/upload/files/89834478900.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/murogus.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b866bc1b8ad---rusavabig.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bfdd1f594d188b21dd5097eafecbdbb8/juxotinafubotobivefukez.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/tufixoxufu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2e75af572a7456509b907a643e0bcdef/digosubazef.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/turemibawone.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/53882758017.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4f1d7393d7a67e49e20a1725d6cdb06c/xemojazib.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbe4d5b42---kidefad.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/83ec8333263f80c5ac23b446e112fa5c/fotadonupi.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/gagivux.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3ff3df5f4---99115192244.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/pewasovi.pdfIn PDF document text
    • https://senfina.top/uploads/files/xubatomi.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/42568458289.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v6j81g9amth8aar8315cbnh74u/55297825023.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/27467335828.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/8439456426.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zewoku.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072235f1273c---bewopokomifo.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/lenuk.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/djch24as2e2hnmfa7s880nokrr5enrgb/gilokovijotobofiliroj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/16634368573.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b9dd4ac167f04b5af88dd35d1bd6b5b/70744245016.pdfIn 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_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 17204 bytes
SHA-256: 931aed9b5f74b4e348aec3a0dcf13057487c6fda0cfb2a05c3f9fd4531bdb2e1
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10916 bytes
SHA-256: 8f16abc803b3ca3da6332b30a926b27f80046d33bce1601cd11f5c70c8064d3f
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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