Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c1e003f9bc3894…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 04:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3185918b19ea64999d0c213e35ccb37e SHA-1: 2c87850e14dbd5b15642f78f59da4231cbc23b3a SHA-256: 03c1e003f9bc389413a35e605ebc386c9062dbc9835724c1acd84a39e8464d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The PDF structure and link farm heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9d6ccd8dae01916169b7734decfe9579/bosena.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/zoneba.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/14065804001.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062110461910.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/69005922816.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/ruwiditajomujaviwujizibi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b084171d---nutazuroxi.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/94716849002.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/40984746784.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/votinutefibinifa.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vobujon.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/4971623637.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845c62d65ef---9135724326.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/26653883800.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/85178275323.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b6844040f2d4a994fbd53cb4334c3fa/75969424669.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210718093654.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/gedanizovoselexite.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/77165264732.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2a7bc71f---12743669141.pdfIn PDF document text
    • https://ancoraeducacion.com/images/68834246539.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/wifetevajuvuravupetum.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161202c7013af3---digaveruxotorako.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebdf715221---22958471962.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/savezuvimirigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ket+reading+and+writing+pdfPDF 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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 17956 bytes
SHA-256: beeecbe8d68bce558224788dafba9f6a670df07bd2efebf5967a2a2552727b47
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10416 bytes
SHA-256: 3d501afe70c7030924e1c389d2fa2eb9f139b9af8569625e94ef605199f970fd
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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