Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e78fe4ecf77cff…

MALICIOUS

PDF

75.3 KB Created: 2021-06-25 22:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 230855111d12d77e0e318817614142eb SHA-1: 5a04bd465e393b9c93e4ce3b2bc47ea2bb71cb80 SHA-256: 73e78fe4ecf77cfff187ac1e0f99b555631ad6614e45d2bd903fb499819f541e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b4c15de1---97410731535.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3e771924---99421380712.pdf
    • https://driftwoodcc.com/userfiles/files/buzuvu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3398b0ae3---junapidixef.pdf
    • http://drairtools.com/ckfinder/userfiles/files/datetobolibajeku.pdf
    • http://szentimresiklos.hu/upload/file/vunuruxuwiloti.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/2220336841.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c947007641e---43675009486.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb473db247---73454763865.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badf501f706---zikimazobanuralosinipumon.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f16djel47la2rjg8c8o3q8u558/samadotod.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/02ad9d526f1ba8821e49bf1ac4f52431/debavutozopa.pdf
    • http://longvu.vn/Images_upload/files/55686074786.pdf
    • http://akwarella.pl/user_uploads/file/nadunetumo.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d77bb8772---62353846999.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d24a2f6275cd24e3690eb19336cbba60/wipiretekifokamoniginesu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3928e7f52c---13531054094.pdf
    • http://com123.vn/uploads/file/razurufexazepedemasope.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5glvs91fe0in579qk89qe1a063/mubakeboro.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/533a27244154dff1dc3d1eba991ba3fc/72138644765.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a7cf138b---bofolusabafudunibopof.pdf
    • https://vipbeachhouse.com/uploads/editor/file/55904341296.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2cd32684f4b516a50b176501e8537f57/91830538118.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qtmjq5qldj2aavhjha2vf33pt2/dixetujavudav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=molecular+structure+and+spectroscopy+pdf+download
    • 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_off0000c20d.bin
c1d9e07d943ea491b1941a63f625a8562cba2d36849fb0134e190acd3f5c7154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 17492 bytes
font_01_sfnt_off0000ee33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
font_02_sfnt_off0001064a.bin
e00214555d94f00aae611def27a7cc21d439db9c55132a35e874f812434dc283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10816 bytes

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