Malicious PDF — malware analysis report

Static analysis result for SHA-256 312f50b8a282e20c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 18:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a910abeea09d2e793f327ee78e0b4799 SHA-1: 963513d461016fe247ae31ccfd5d6ae6746fc0ea SHA-256: 312f50b8a282e20c07fe5984e2ca4dcba2b3cc85e24070e703eac77a7a0f5fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=figures+of+speech+definition+with+examples+pdf PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f77a15fa---8636148291.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a3d014df697f2b2a8e389e285eebaf05/28248793036.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f58018d5c0308eb635123a637072bd5d/sevefavisinegaradixub.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/su0sp7tptcnp6f126jj5bvrmek/gesizinudep.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/43603282420.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c093b250acdda3652fbadc16ac029cbb/kikopowatozogitorimoz.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/52437620988.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/zinaronud.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/bitenigusizowira.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/43007375685.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/vavoburorefaginul.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c59003f6b1199cbf553b36ee615cd055/sabokazuzibozuz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588002ef13---wutemubere.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/50050066893a54023906357467ce79af/kaxopofipejefelun.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/vitituton.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73dbc2cdf---15012115834.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/40737756637.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sad7jsjnplnqp8sqlrjc46ml04/tipum.pdfIn PDF document text
    • http://mega.kz/media/upload/files/45941305732.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/mupikumagodod.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e183cd34df7---dapofafuminete.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/48086552935.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zivaxusi.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 11332 bytes
SHA-256: 3c3c8edc062deeaa35e6b5a2f8fd32f31d874dda228afbc37e8e275ad43b042a
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 17536 bytes
SHA-256: 25d04a0c8a3a360b1bfc67679408779ce0365ec0df980a631518a5dc22543b38
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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