Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b803363733b23c9…

MALICIOUS

PDF

151.0 KB Created: 2021-06-25 22:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53e7c761144b3e9b3c3ae4dcb0166949 SHA-1: b2f53e24e5d8f980d74a4d1c7c273b3f6d570ec2 SHA-256: 9b803363733b23c9dba7e7ec90c7edf8918aef654c5418480be0e3f6c69bd3d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, designed to lure users into clicking potentially harmful links. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://synerhu.ru/uplcv?utm_term=dubya+dad+and+dating
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39090ab82---27262240716.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5071o1qv67d62e0v0ukevjdrih/wefobadetewaj.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms41d9ur0h08p88agh83a3v0nu/17701966179.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/xulenasimipi.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c54ntbvqsfjrd9kqhu7dhkdqh6/21651242294.pdf
    • http://apexnepaltravel.com/userfiles/file/58719006311.pdf
    • http://abwcrainhwy.com/uploads/files/wuvegevitag.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3ef0e5fa---punofizumuv.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc373110c91---3137952804.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caddc81218---kerudam.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2b18f089---jekanexima.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4llrjf15m475uvbp3otf4rsdqv/fawelas.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608703e9c0470---18380815965.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n7i665oevvjrj99g249v2cljda/zesojirulorupogukilexakod.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fdf2d45fc36988498a6abc4b11ce5761/savut.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e168b9b307---18845986544.pdf
    • http://atut-biuro.com/uploaded/file/47962127200.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/61dc278863da984f8d69c7ddeed4c2b0/bowuwavabiga.pdf
    • https://celebicatering.com/upload/ckfinder/files/gatematad.pdf
    • http://bkdesign.ee/userfiles/file/7609236977.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824cddcce12---1292136277.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085baaf39f11---kexedigejabez.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0775c76e51be094aef32dab515c4d11a/34186878249.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_off0001f04e.bin
bbfe0277221af713926d207460f98bfe677afd0d4c99de27f578e5a26bfbea07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F04E 18196 bytes
font_01_sfnt_off00021f9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21F9A 16792 bytes
font_02_sfnt_off000237b1.bin
a0b8cb00e1f609d745e0262cff91b6d395b74e665ba746bbbc656f6a086d92f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x237B1 10212 bytes

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