Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d703d2b0150d6d…

MALICIOUS

PDF

102.7 KB Created: 2021-07-21 23:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1a64c8841a202dc3da0471f00c22301 SHA-1: 1b7b29063525fca9034a813ff6e3d871d6d6d8f2 SHA-256: 82d703d2b0150d6d4c5625bcd1d10ed49c8484ad4b1b1af9e8d40d5c4e548633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc89994f74a---jelasavanalupapifego.pdf In PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce403d0f3---87331831917.pdfIn PDF document text
    • https://papiratisk.cz/soubory/jagugugudobimalafexininu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae97d3bcaeb---22794342669.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/18891996083.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/33904974208.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0808ff46221d3c59b749c708a1237e39/26130799317.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/55414244296.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/okv17sa6k7j918v8lg2oq354i0/14400325059.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/42648689888.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a08caeec5---86942135929.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/kafedakafu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0956dda56fb0a706a7805c89e0afe409/32690464042.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4ae6bf6b20a33a35cd4bb3dcfdb10b6d/43055319607.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0679989c4d3f9ab1774a48cea8ec477d/rozivabigolu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a162a65ce---43404579078.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075e14d83984---wafimamulipumazamed.pdfIn PDF document text
    • http://hasyo.net/files/file/dobanatalirovilira.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/71823181358.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a62def3f1c---misunaxabamarujumuf.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/denexigeku.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b20gbeu8foddb6fao9q6iuheq7/lonulunuzokuvanorav.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062721454977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tremor+in+my+thumbPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 17480 bytes
SHA-256: 031c532b1cec366a718a66bd6b22585758e396aede54943bcf74830c1527c398
font_01_sfnt_off00015dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC6 10316 bytes
SHA-256: 080a9c04ae91f1e52d13d3380b9ca31d0d46997827a245d3f6059c5cdead78f0
font_02_sfnt_off000174d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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