Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50b3f291c7db126…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 06:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6f89c9de4eb1c8d26a7c87a92d73071 SHA-1: 51e4aa3a89617e232e34d9a1bf94ca9aa3017c1a SHA-256: d50b3f291c7db126f5bda72229ca73d58a26d2aea43a6bb6ba65db6794fd954e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a large number of external URLs, many of which point to compromised websites or link farms, suggesting an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=soap+note+sample+pdf
    • http://braciszewska-klimek.pl/fck_files/file/kametumakosep.pdf
    • https://erdemlerkoleji.com/resimler/files/kukubuxamokikixok.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2834b28554fb946c2beb1e5de4a17491/2998008161.pdf
    • http://coinproject.com/userfiles/image/file/81877536581.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///powupiragudarenixomabip.pdf
    • https://fablab808.com/nbloom/fckuploads/file/280914093.pdf
    • https://venus-forever.com/image/files/23723136231.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/94695505494.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/erlgb3cnatukgku1nm2bb1fd19/konojavugi.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dcb41cd23d40c19d06e8b64b880f24bc/37828777871.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/gurevewuxoxowojoba.pdf
    • http://mmdplus.com/userfiles/files/20210601_223023.pdf
    • https://tepihtrava.rs//files/79843600601.pdf
    • https://papiratisk.cz/soubory/vubojitarupezovopob.pdf
    • http://xn--aknmedical-yub.com/uploads/file/jotufajomad.pdf
    • http://krukaiart.com/userfiles/files/92260708968.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/icdcmcmt6o0qe858bccnc3vr32/wujeb.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/1um799fdkfm1l1se9nanknaugs/taximidudomus.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae624b3a6---gikatuliselapoluludabavok.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/73deebedba081dc5a9c94b3ab4408eb7/gofotesozenudemanixuxugek.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d1be8c9fec0ed933493cff0a21596341/tuponizifidixirupe.pdf
    • http://ozgu-yapi.com/firma/files/limale.pdf
    • http://technoauto.jp/js/upload/files/29451793672.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/41663256878.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8b.bin
a6bc9204f190976e8c9575cdd3dc9c6736037a47252cff90ddbd79b2f6f5ecbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 17696 bytes
font_01_sfnt_off0000f87e.bin
b5468dc987498fb87b73dc8934dce8720cb48cb6028806a2ec05642e62dbbd3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 10544 bytes
font_02_sfnt_off00011080.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 16792 bytes