Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9f5ba8f7136938…

MALICIOUS

PDF

119.2 KB Created: 2021-06-30 02:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 56c2f4a492334284d23a400ebd6e5570 SHA-1: e5d8d0695d575945fe44ae0d6fe8826d61df6da0 SHA-256: 6d9f5ba8f71369380452cd9f6b74f63a9efc28de9d031d7b9bd2fd81a72db5f6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into phishing scams or download further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

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://ketchas.ru/uplcv?utm_term=epicurean+philosophy+meaning PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e7b8a87a76522a9245aff14aadd96a16/budonidirogo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c89a2fabc7d54f10cb09b88cf7edf93c/pasezogofozijejisez.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f710a35a---degezibede.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/71d8bb40060e9ccfa1db736ba3439a6a/zanevebuvixagesurez.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608318ff6aa8e---13690725425.pdfIn PDF document text
    • http://absigorta.com/E/file/jamikitopi.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dbtql84m9ci2s22c4589080ob4/jinalidubijinaza.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/munuvowozazupa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/22ojvae8levsg08e21sjotn2a2/34573630671.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a974b6079d---zibowufoworipebufilizow.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/47053486784.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/77939005725.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7144720c2---16210310874.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30be0bed7---5943571627.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4ff2576e---ligumewigetimog.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/71476990513.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ut1j7dmd4ttns0nraui9sst0g6/48212698967.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/farimapunotebofoxanodezav.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pozegovitemugidelawarewat.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981cb6f47b---27756580767.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/49159163402.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/94452194494.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979bdd21237---fugabakebefit.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/47822274946.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/xefolulixasivuk.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/22131980575.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/37052a1dd37051c0f42627fbefd7d2ee/47507659888.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
font_00_sfnt_off000158bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BF 10920 bytes
SHA-256: f0fc4cd96618d216c799cba082f2174e8a03fa3c163ba6a1779ea1db344b84de
font_01_sfnt_off000171d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000189ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189EA 18272 bytes
SHA-256: 82759eb5f3800263d23ff45a4877f495e59d80a87b0ce7128774081bf1caa79c
font_03_sfnt_off0001b7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7F4 16692 bytes
SHA-256: c9ff09b0ed5dcac8d3eeaa151f502f3079e50e30ce91d0f5684116ed4b8e20a0

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