Malicious PDF — malware analysis report

Static analysis result for SHA-256 770ba1ef3ba5b5e3…

MALICIOUS

PDF

103.3 KB Created: 2021-06-26 14:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba0c7a058bcbf9abfe388956be5afb09 SHA-1: 90192ca29ace04670b8fbf1b890bd37805ba744e SHA-256: 770ba1ef3ba5b5e3c5288cb445e9a23e420c678c7f09f1b8e1e7c4257b5f2994
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/06036366f0b80dab24b3fb2163d4bc91/96347985872.pdf
    • http://kayamedbursa.com/userfiles/file/kovulezumatiguzeruwigogop.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/pajitokalawuwekowo.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cddad1a6---kupamoxofiwotaguni.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8692ab2bd2c772732d861d977a486af8/1365929351.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1k8akok3ngbc88l0uus3pqcj5p/wixopisixovoneke.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54e410d43---mabopiranowu.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5b2219e25fda9d826ad14889d17ae306/93786248816.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/09ae0353bb8f9085575eccf30d002185/fedejar.pdf
    • https://alutat.com/data/file/1257609476.pdf
    • http://polymer-optix.de/userfiles/file/67960866785.pdf
    • https://samarpanbharat.org/trila/userfiles/file/lakarujukikujoperiroriz.pdf
    • https://aiaciran.org/cache/fck_files/file/85565313467.pdf
    • http://ferramentabelleggia.it/public/file/82797906487.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608913bd0316a---gapadizomirezaporaguzut.pdf
    • http://rauvuonsach.com/images/uploads/files/17820192121.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080460e799f2---23584716405.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f81806e7---xavidokatepo.pdf
    • http://automsystem.com/UploadFile/file/20210519091758916.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5db1792b---voxasog.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/274ecad35a92c9504daaf4e90121c936/70054818360.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b09bfab655cea2cbac06a009da7b2b05/41473331431.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cba8fc0382d88ff12f51154b46a33d19/88707031930.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2+month+old+chihuahua
    • 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_off000132df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 16792 bytes
font_01_sfnt_off00014af1.bin
81740e6a91f0ae66ecd76c9845296662fb6182760c18783f88ebcce5bd2f4429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF1 17064 bytes
font_02_sfnt_off0001774d.bin
2b6db72acedc6e7f953a973509da348ac4a5334832dcfefbbf42751b273d9d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1774D 10360 bytes

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