Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ec04416317c21b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-24 21:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9896ddba75131c7aacea54b0fb8d2b81 SHA-1: c8c731c1238939bceae70e2119aac129b46eb9e5 SHA-256: 94ec04416317c21bdfe01a20b12a01e3356b5d38cd109a0ff6db6498ee5d0510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=who+are+you+telling+to+shut+up+in+spanish PDF link annotation
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/59dad268e9ea60108753bb31f7aa183d/87473990369.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/lotozevupepiluwep.pdfIn PDF document text
    • http://terrietanaka.com/library/files/mewep.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/4008786471.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8cf6bf39---88882533282.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/23267975249.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/zuzixetidulatozewomedete.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/1337472363.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/nawotavewokeropewoves.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/luketivuwokinu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210511193445.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/22444076604.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/tiwamazogekenofiselavorut.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/nunafovuf.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/39034472355.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fc27140---70242606011.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/miaoltmp0ug7hdop1hde327204/juxubaregogolikimoka.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/55c9fea24dfa0ee34eedccf00479c07f/zawesi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7694bbef---paxepigiwel.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc874318682---90639826813.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/wigezom.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/45021839554.pdfIn PDF document text
    • https://oversaslogistica.it/file/83490415357.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e25208aac---vikimani.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013450.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13450 19836 bytes
SHA-256: a207bcdc623d1490ca86f758195bb9bd869c6e7b716e1fcf2a944dedf86354b0
font_00_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10736 bytes
SHA-256: 7859335fa9bfdf5ba2b453e48318761fe49f220c34cbba6d7c47c3cd99efadba
font_02_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 17416 bytes
SHA-256: 860efbe17fc7005ee0892b71993cab8eda2d851e821e3f27eb95aaa1e59b92ac

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