Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d21b852f126c573…

MALICIOUS

PDF

118.4 KB Created: 2021-07-25 09:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4670c05e666e5145bc623db589b8471e SHA-1: 19bc9194dfda96dbe1aa2a2976c2f2be8ad39e90 SHA-256: 8d21b852f126c573ae8e552c1b20bd0c7a068b6581d32a8e5a7350d531e67a07
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, suggesting it is part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9598

Heuristics 7

  • 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.
  • 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.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a925606e2---masonilaferufuzedeboj.pdf In PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210617095051.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086a92e6fbbb---24342653941.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077571f622f0---90452553491.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/toruma.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/14628253807.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/75083859221.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/winesaxeb.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/ledab.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/10ee9d8921ba12ee689fe71feea6f014/nifomokik.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/45ac2603596967707a645b3e6be9360e/65996973955.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ponub7agkcqn2473koh3ddmgsf/91281618930.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a06e683c---vizudidepinav.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/97406eee4a0ac45765c73e0d314b13b8/15561306866.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/12891552798.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/p8j1ojgl4lqu1i7ia043ir8ds1/61679396104.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df68f541a8f---2253847960.pdfIn PDF document text
    • http://industra.sk/userfiles/file/2699009460.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1vvgvsc19smjptjnqs4d76i11g/jevujonuweworaxuwilisi.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/bikiwe.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19594038b---21307438355.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948bc79510c---40865845091.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35425794780.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee68fb84486---18127522999.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912f2af10f2---80821130331.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zoxizerakumexixeboxum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frontline+commando+d+day+hacked+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBD 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_01_sfnt_off000167b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B2 10736 bytes
SHA-256: 3eb8eefd2b485ca08f378718060caf245198dee103e77433805de1268989cc76
font_02_sfnt_off0001802c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802C 19304 bytes
SHA-256: 7a3f51b647652cd3a9762b42834a5fb62c30a9e4f8cc565949cafc36be3c4ba6
font_03_sfnt_off0001b2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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