Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c902c869af5aa9a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 03:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86c728c2d86ee37eb689c3a00131eb79 SHA-1: d273b0f75956787897d4bd19fdb714fea5594161 SHA-256: 4c902c869af5aa9adc990b6bfef182562f8001b3e674caea8ddc16ab9f10da03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=pokemon+go+mod+apk+with+joystick+download+latest+version
    • http://xindeshiye.com/uploadfile/file///2021090916265847.pdf
    • https://cartolmania.it/file/xujazuleboribikef.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/87259445665.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161429e300b3ee---dexotofesukeb.pdf
    • http://lulanjina.net/upload/files/2600047673.pdf
    • http://carszana.com/image/upload/File/31489446464.pdf
    • http://gediklimakinahidrolik.com/resimler/files/79250385771.pdf
    • https://jensbrode.de/files/file/15779102704.pdf
    • https://yoimart.com/upload/file/20210917140021.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/lagekijomivugilopifofip.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f37346c186106b7ad2ccfdafb66c3200/50798403584.pdf
    • http://unixsensor.com/uploads/files/202109200812527422.pdf
    • https://milosislandrooms.gr/userfiles/file/zevibowivizeduk.pdf
    • http://worldprint.su/userfiles/file/rijenora.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ac578a9a---10409637797.pdf
    • https://democv.associasuite.com/imagenes/contenidos/files/63591877165.pdf
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/fajilabudin.pdf
    • http://urgentcarepb.com/userfiles/file/lanasuwunewijemine.pdf
    • https://europartner2.pl/uploads/xidubidojenizezodex.pdf
    • http://cantinachitarra.it/userfiles/file/ruvaponovafemefopinajov.pdf
    • http://studiogiamberardino.it/userfiles/files/85988406825.pdf
    • https://luxm.pl/userfiles/file/94116803797.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17626459737.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujefasuxide.pdf
    • http://swiss-ex.com/images/blog/file/wikitemiwajodusilezo.pdf
    • https://ww150006.linebot.net/upfile/files/20210917202649.pdf
    • http://korvet-sp.ru/userfiles/file/80124604563.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_off0000d15d.bin
1cc03185da9a2c743e88264a157e4a3165a5af287b8d3864f1ea614b3ac41aa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 17980 bytes
font_01_sfnt_off0000fff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16792 bytes
font_02_sfnt_off00011807.bin
7774a085c394c700dfa7362778aace2d7f2c033ba33dafc3591daa4165a212a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11448 bytes