Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b0d84fb9570cb4…

MALICIOUS

PDF

81.9 KB Created: 2021-08-16 17:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36385fca33016a6a75ddcb5c4fcd95e1 SHA-1: 1286d7118644f94362f1f4f87eccb84f9a54d59f SHA-256: e9b0d84fb9570cb48969d838ec1d62496b94ebafa04fee0ee021a85cf7c43ccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to external resources, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://hkfew.org.hk/ckfinder/userfiles/files/33939858354.pdf In PDF document text
    • http://shortguycentral.com/ck_uploads/files/74776592411.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/paxigokiz.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/14846927355.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/54372537120.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nutisuriresewetejefam.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/56198961964.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63fee77cd8---lakafatafawazuvizunulefuv.pdfIn PDF document text
    • http://brlairport.com/images/file/89106340121.pdfIn PDF document text
    • https://triosms.com/userfiles/file/dukibadibiganetorunufi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d81fa93d42d---kanigapevokezorej.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fce4d4ab701---48147985990.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/xajigekurexe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa12d3560d---biwixilin.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/kadixu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/lakabefotodaxiku.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/af0ad524b9a443fc8d48904859fafb83/selogalewiduramopi.pdfIn PDF document text
    • http://amandamaitland.com/images/file/97376776368.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/vijegesuxewidono.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742fea48993---56895243227.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/gimijatubejotunox.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/51c8fb2c5749e5b553d80919ad2aeca9/21703068661.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/j72ir9mfl7o21u4s7kqt6m767a/54886771412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=asclepius+wellness+plan+pdf+hindiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 10568 bytes
SHA-256: 196368a093184b82564a5cf5448f9e7bcc5f080dbd7ee9c1a01110385f00459a
font_01_sfnt_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 16164 bytes
SHA-256: 3ebd486235ab6c407a74d98ab9e1cf09d7661342c8c98090703f1c8ee3396579
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 17188 bytes
SHA-256: 45ee8397eaa1075025992df50fe9c4b020e2fe64d47b4707b9f64ecee91c35dd
font_03_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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