Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb2d3d36ab033ae…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 07:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71bc802f0b34d71a9468efeb14e1edb1 SHA-1: e246aac58990d002f5f81f3d78603e6e3487a4fa SHA-256: cbb2d3d36ab033aeb50b014e44c837352452737772e86413abf120cf5daca33b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or delivering malicious content. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and potentially host malicious files. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://remobudostol.pl/pliki/sopibunupiramarevi.pdf In PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/72991725141.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/28703318307.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139a548976da---rafazafotatuw.pdfIn PDF document text
    • http://podarox.ru/public/files/96147188306.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/bugafa.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/43846327378.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/wuromalikilug.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/68322797373.pdfIn PDF document text
    • https://kimcert.net/E/file/liwazovidafaserar.pdfIn PDF document text
    • http://potya.com/66181561506.pdfIn PDF document text
    • http://cx-gl.hu/images/files/lijavavebewazefefijoju.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/sopefatevasef.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/wotelojikubugorimesise.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/fawukoriruwemibag.pdfIn PDF document text
    • http://voijin.com/userfiles/files/23606099259.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd67d94f11---13020177630.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/votovekafo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdcba394db---ruvotugijovewimasijolo.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/96023686276.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613994c4271d6---liliwiz.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_C8ED3C278B2A6CD4.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/43987060026.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/44801778805.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/24373565319.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/69147017850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+can+i+play+pc+games+on+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10952 bytes
SHA-256: 588f107346e5c74a169354e6200575d8a870e6de91826051db0c9666fec24924
font_02_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 17824 bytes
SHA-256: 4dcfe1ca424bfee7348b7394b0c7fec327988b05746ac9cd113a6ee4bc0906d7

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