Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af6b23edace3948…

MALICIOUS

PDF

111.7 KB Created: 2021-06-27 19:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74f3dd0eac5f124612ec0f661102041d SHA-1: 48e0335aab94b7c29fb50a1efd57a4b8958ff041 SHA-256: 2af6b23edace3948622be5bdc0b48cfb234764a0219b5810ecc27d21ecee33c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to obscure the true destination and distribute malicious content, as indicated by ClamAV detection and ML classification. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=angel+closest+to+god
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fce46b8cb---bebimafat.pdf
    • http://hydrem.ru/images/file/rixekemijanidekunuvejojor.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/00b35cdd23496b23cd50e67d0bae7d32/nexorefenarokanud.pdf
    • https://aawyx.com/sites/default/imageuser/file/kalanuwere.pdf
    • https://communeouchamps.fr/userfiles/file/89794732036.pdf
    • http://sooclose.eu/upload/File/3020463445.pdf
    • http://rzn-house.ru/upload/file/77616779826.pdf
    • http://saovietgroup.com/upload/FCK/file/25447077131.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe6d27db3---daduwugexabufod.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/727d20432aaa8ac5d7072f12efdae2b8/zisinawojekibebakasugu.pdf
    • http://yaqeen-eg.com/userfiles/file/jofuma.pdf
    • https://aashianarealty.com/file/42311026437.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/982251dc6cfe9bf660ba789851057c52/29997975913.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085117f9eee1---roxeduralijodewalew.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078870da45b9---wesesukaxeg.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed6f37493---87639205156.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a2502406---zirogexadixinaro.pdf
    • https://alrashed-alsaleh.com/userfiles/files/80477852403.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/84c0ed29efe67ab2d630151a33273e10/mafonogufuxud.pdf
    • http://licausi.it/userfiles/files/togufu.pdf
    • http://fructusartis.com/i/File/fujagazatatupatape.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/85293d709c1fd70fc23d48dfd9f84468/22838253480.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/kuwikinazawubikina.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/509ad42b6aca6dfce6b4d860d2de2516/37001540922.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013216.bin
bf5bac81a52e7499478e83447185981e929bcc4b596e208bcb6ea85b4ad73447
pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 10172 bytes
font_01_sfnt_off000148d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
font_02_sfnt_off000160e3.bin
a872b13fc2e4a9eb02d177d67e261919c55354bb87c8c916378407f141713fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160E3 18032 bytes
font_03_sfnt_off00017d7a.bin
e2c32edf0325aee8b6079dae102a930b031a9c685a27da17f0bcf91a0aced4af
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7A 20368 bytes