Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46e298eaa2b81db…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 19:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea25466f81db85f72047fabbcf68525c SHA-1: af782f8e734a0f4ee663c0c4b2f2432d7d282c64 SHA-256: d46e298eaa2b81db0e226461e463b93eaaad0fc997c6f7f07f1bcc5b1801363a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with several heuristics indicating it functions as a link farm. One notable link points to a compromised WordPress upload directory, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kapelski.pl/userfiles/file/59110613749.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/gaxevavemugeler.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/31916860297.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/wisuvijugipibuwirukivuxa.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/vonavip.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109021642285813.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f020abb68f---11250080551.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/8012717892.pdfIn PDF document text
    • http://someteme.com/archivos/_20210905132153.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vadomepif.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rimosotolavudanax.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/50032454560.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/89774756473.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/22335069546.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428d30cec08---nakobawepolinofijaxavew.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/junobudugojujadinuk.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-20/20210920045718793964.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109152153367386.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a4b6f04fa---98582084780.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jarebigewefoka.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/bemuzefewudotelefipimode.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/livod.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vazafamatifo.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/loxepisogijefewogoritofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shrek+3+full+movie+123PDF 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_off0000b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 10624 bytes
SHA-256: f39a4f4f3ada366fcc17a48b7912c8cb486f02e118de3062fb5490c33218c4cc
font_02_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 16036 bytes
SHA-256: c59e4b06e99bfeedd21354e13f404dc151e6a663b74033b9cf22d9369933e712

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