Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc16decf835c5fa4…

MALICIOUS

PDF

89.1 KB Created: 2021-07-04 06:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17704e0f4d74d18ca9fa25a8976be9c6 SHA-1: 3180b12e6b93b36a6fa4c098c76f7307fbf99903 SHA-256: cc16decf835c5fa4eadf92c405cda3c63f9d5ee6b7513c1674cd5cc816ec148f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites and disposable hosting, likely to download further malware. The presence of embedded URLs and the 'download button' heuristic suggest a phishing or social engineering lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ef7d7dd0213ab945585037d280985239/91702282565.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dp62vd93b359jcm6mvhbl6ukg9/baleruze.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca2a8af9e---wopasexosaravubuxutu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e295e5cd---67210217993.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a267b32b0---93712106624.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacd5481aa8---jazeraboralupafimuwir.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c3b8f736a7eb07532673ec1346bc231a/jokelaxi.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/poruxikuniwawowurejip.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v42jkibl2cnfm8m8r2rnbju55s/67045993422.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c705456f312---fimavezo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zibasibolaluziluguturimub.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160da60ec7b64a---turavifuxanuwik.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608265fa489f8---83551859428.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/35734e8c3d108700ccc0ae9c6f5f94d9/68309492435.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8d6fc745bbb8c6dfdd8ddec3f225f85/xivuveremuwilobarabad.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/60001841660.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/3042784068.pdfIn PDF document text
    • http://gyobel.itpublic/file/tiwovepivuwezesawod.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fa492af3---kanidexidezuzepamumi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/42388227413.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/09a09a33e042dd40b9f2649414e6633b/vizuwusi.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/53290844818.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/oi5oe6cks1r012tfc0ll8apkl7/98521350332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=monthly+current+affairs+pdf+2019PDF 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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 17316 bytes
SHA-256: 94b2530d6ef12fcf1703bceb8c9736731c5be722b036b632412145ee598f5b6d
font_01_sfnt_off000122a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 11384 bytes
SHA-256: 8543a1aec9539e9c519936ff8629bb224e3c77555c08b2f73ff75beab73d16ff

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