Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4e16a8c0292c7c…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 18:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec074cc0a21ba9ceb848b5d1f140a02d SHA-1: 4c7d88d628befef9a1f700d4c8d2d4f0affa3381 SHA-256: 9b4e16a8c0292c7c6f752d0eb8eb1f8a9d3c9b5fd5f5732445e609ff766d5709
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Additionally, heuristics indicate the PDF acts as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flygarfield.net/userfiles/file/10984706751.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dhsv55c860ov6rvpmrje9jo1n4/92604327833.pdf
    • http://baigeleather.com/userfiles/file/xinuz.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/2603jpjkjb7enj5to37r4l02cp/gemirap.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sogekejolunivebenelawij.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/oeocektpsgjkrjbp6m8u5ktgbc/gofofunilefuzu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc99be294cc---45558896809.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d3ae8640---xamifeguzanabuwiregaz.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6da5c3333209b33a914fb88e5491ace4/bivelawexexomewesu.pdf
    • https://artenika.pl/fck/file/zizijagob.pdf
    • http://fedoro.ru/upload/file/99607646501.pdf
    • http://at2apigroup3.com/contents//files/jasuxatoreboverosoverazi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bb1c623626be4e262f999f5368d3977b/90843400815.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5b2c28b5562491afc0d9b32f1a952cb0/kojabitem.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893712e6106---26809616079.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608979fe487e9---pijemidebewesa.pdf
    • http://firegallery.ru/img/upload/zogezu.pdf
    • http://ameshamagazine.com/js/upload/files/80141395993.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ee20fb650149534a46acbd18d40e29af/87697243151.pdf
    • http://ajivikafinance.com/userfiles/file/fodiwibubelan.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210705213535.pdf
    • http://www.zaluziemalina.cz/userfiles/file/motet.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de00f50dbd---26978320803.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7369be1c92---28076746772.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=example+for+non+benzenoid+compound
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10a.bin
17f978383ade4f1d52b2d77a9c611b1066afe0bf2c63105ca61019149637c093
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 18612 bytes
font_01_sfnt_off00011160.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16792 bytes
font_02_sfnt_off00012977.bin
88acf7705a02072202edd4a65e41363629263a89a57a7d4ae735656e629de6f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 10900 bytes