Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dac9f70332cdae1…

MALICIOUS

PDF

91.3 KB Created: 2021-09-13 15:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54de1b29ab43661401c550199fc5b501 SHA-1: 9a21ebd1fb06c852e2c4b4f27f73ffe689831452 SHA-256: 8dac9f70332cdae14a2e738613c06766ddb1ac1af17ae12bb9f6a9b61ecf4634
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress uploads or disposable domains. This suggests the PDF is likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://blessingsngo.in/userfiles/files/pepitilidadedepatebuginow.pdf
    • http://www.cottagegrad.ru/files/file/vetekisi.pdf
    • https://plagij.at/ckfinder/userfiles/files/migopimovonuwifidapeli.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80d17ebd---megomugovoju.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/03912a785024bb891e4ec79f6cf04e46/bumimadikisevabevevo.pdf
    • https://investincarpathians.eu/app/webroot/media/files/rekuwozoxupebit.pdf
    • http://chinahongji.com/d/files/41588741057.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/62471445806.pdf
    • https://dbjadow.pl/attachments/file/4788828094.pdf
    • https://linhngapt.vn/upload/files/mujilumowejexugunikumid.pdf
    • https://concertwristband.com/resimler/files/weviwofodosirodud.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61926282497.pdf
    • http://homeopathyhongkong.org/files/57338782410.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/046f91d40bf42580e834dff6afcfae94/10477515776.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/17417280837.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29051403175.pdf
    • http://bkm-market.net/userfiles/file/87973559706.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/36890033868.pdf
    • http://chapraptti.org/userfiles/file/nowipod.pdf
    • https://classykitchen.pl/web/uploads/files/54149367713.pdf
    • http://www.bash.cl/media/file/jogonuxo.pdf
    • http://goodwill.pl/userfiles/file/lulawidoxuf.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/72333468199.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/bimalejelewufunep.pdf
    • http://smolninskayahotel.com/userfiles/file/fulorudemutesu.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51bcc3902---71140895536.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gta+v5+ppsspp
    • 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_off0000fef0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 16792 bytes
font_01_sfnt_off00011702.bin
0f0130fab2c745d534f36391d0f77418d6cd3b8d6794ae0485abe75ea8ce871c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 19692 bytes
font_02_sfnt_off000149e2.bin
e71f265754ed36392b597ba0b09a56b2c9208f8e8be24e13925b27d86011f556
pdf-font-stream PDF embedded font (sfnt) at offset 0x149E2 9888 bytes