Malicious PDF — malware analysis report

Static analysis result for SHA-256 751bcfce4e94ff26…

MALICIOUS

PDF

73.8 KB Created: 2021-08-28 02:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81fde695c206c2835be3343365f0a8a2 SHA-1: 710889514c528f0fa984a3c48bde9942d2253d6d SHA-256: 751bcfce4e94ff26d936e05ab71d28b677fb43285d128f71609f269b4afe1a6f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d81aef194ab---95798962790.pdf In PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/53290086190.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092d22564823---36664398330.pdfIn PDF document text
    • https://ancoraeducacion.com/images/7142237219.pdfIn PDF document text
    • http://btfa.tw/upload/files/5249764701.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e3fb82ff---joxutilebomemewejepes.pdfIn PDF document text
    • http://tw-go.org/files/guzipufamomukupof.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/valepuxozuna.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/77695823073.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebe284422---melusodelaxiliz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714293b1193---sevomudizitagekujati.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/guxazatiwebusilonuvodabe.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/janaxekedafemave.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tuzefomumiwabapur.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/xumujedexarodewulatudu.pdfIn PDF document text
    • https://datajournonepal.org/files/fifakowasifiko.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/kotebeluta.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/74954224245.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e389uce6399kfspgmjg8c26s5u/riloxavabinewa.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61248470D60B3.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e2797b7cf180d64fb0989c88a3bfe523/nefolozupazunizazexike.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/votatevawowujuwipuxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+remove+glass+from+phonePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b6a5ae894bbd44eb2e592dba8b168225/87992106761.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 16420 bytes
SHA-256: dc1c5ef1fcc03c04382215e9fd266b7929d750815b8cd70d1b763b73a0bfb5aa
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10856 bytes
SHA-256: 6d862dd7a979d4ae6bb3e257f024cec7d3e1746cc2fc39f384232586e1ae6085

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