Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcafd290efbf7be…

MALICIOUS

PDF

133.6 KB Created: 2021-06-28 12:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 455c48d334b781e9aeb65ae6f5a6ce7a SHA-1: c8be5dac53ca28023418b01105d6a9aa0f73bed6 SHA-256: adcafd290efbf7befc803e4e0ccb56d32103f6b39302974d4ec7285688c96362
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various websites, including those hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9282

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 https://krisoc.ru/uplcv?utm_term=the+meaning+of+simplify
    • http://stalmost.pl/userfiles/file/35940245892.pdf
    • https://airshow-bg.com/file/17456096069.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3574f4d80d---fasosedebibonivatufuvapa.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4cd08bb7fa824b5152b77371d0bd8b1/xotabopamaxa.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86d24a1cc---4543419307.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2c76a67f6312a648a9e7a613d51a5c94/53632902507.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/63407798866.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/abc885524098cec614678f3eb1214357/wutuganurafitobutegebosiw.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210503165456.pdf
    • http://askort.pl/Upload/file/ritalu.pdf
    • https://petrovsky14.ru/docs/files/7759079027.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98333670d---64107366811.pdf
    • http://picassogift.com/Uploadfiles/files/67574328497.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a481f6b4---28194251825.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c0077b1c---40272686601.pdf
    • http://bjsprt.com/uploadfile/file///2021051216241133.pdf
    • http://manavpublicschool.org/manav/userfiles/file/37895324641.pdf
    • http://yilip.net/userData/board/file/powaven.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0d4no277fvr7gmccke3sg0b4g7/93881228292.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072099994177---kagesi.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e4a4840c---47201232132.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6a5409302b13450f2663667474d30331/walunepofojagidajegoda.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q4ijkvngim70m4qc1iu7cic9l0/bipexibupegef.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017e13.bin
08fe77fbb5d2c17147b52e42bb817bcbd354d7ec42c252fcde4ee9cb04ff86b5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17E13 31952 bytes
font_00_sfnt_off000123fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 16792 bytes
font_01_sfnt_off00013c08.bin
0ef54b89f12dc73e395ea9215c42031883b9c52cb10cf4543e4749d5e46cc13b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 13692 bytes
font_02_sfnt_off000165c8.bin
dd73bf305619dd62f2809b900e234a081c40fec0bf92eb478af6204378825acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165C8 10684 bytes
font_04_sfnt_off0001b870.bin
4b7a7ac299688ae7225186110ab900506ff5e67d91f29510b522a0b20593df69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B870 35832 bytes

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