Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93bbb284549e610…

MALICIOUS

PDF

82.6 KB Created: 2021-08-28 17:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6482d8bb26fdc384b03440d5828f484f SHA-1: 008d629da9731da179eff6db97a4bb3ddf126b97 SHA-256: d93bbb284549e6106d79cf4a88676012cac5effd454f2b63e2209498ec63a5db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of these links suggests the primary goal is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=insanity+max+30+timetable PDF link annotation
    • https://csmgh.net/pevron/www/img/file/3717899694.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/u2b7bef3lv3eq99fp22afn5hd6/84651743353.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2393ca58---19116921151.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/33006093938.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/8257297967.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/wikudilaxozuribiju.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/jutibudejoxoz.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/86462422776.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6174602b---barexurikukasujufug.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430162828106597.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fv8uucsb4of8jp2n9hnlr8tm36/kufodowabazak.pdfIn PDF document text
    • https://chptravel.ir/data/file/77081847042.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08bc334555---91822819246.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7ceb0f7df---rovugewujexusedutavoka.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0b7bd9b3e7068a074287bb9804d9c0bb/wiwogo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072547b9e907---niposipakaxawuzag.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb968dd0fe0---27265904868.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/borevu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ab2504b60---tumulomunanerubetiziraxem.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g07o6dktl2ooqhon2tjpu9p3sm/nuronazorigopemopo.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/59378671218.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/vadenakuxad.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/87134290476.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bad3dba02529af48b9054b3900ef90f3/tomodikakogomowiwo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/934493bcf9cb963752c2497283f704cf/govuwotowituz.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/dutobub.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/felidelenerezinivobofan.pdfIn PDF document text
    • 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 18540 bytes
SHA-256: a80cd1c42adb965faf39e9caadd8514e1820c7acae6ce0d159cf608c74c06856
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 10652 bytes
SHA-256: e2a141f216d85bb2e8c8f4ae82798c32430758dc34dae4a4fe4e137083312fac

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