Malicious PDF — malware analysis report

Static analysis result for SHA-256 7946818a23f68b53…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 15:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a53771605fd0f275f78a373d30ed262 SHA-1: 29c1ac2155e7b398ac09e378eddbf6a1c278db53 SHA-256: 7946818a23f68b53b570459d52deb79003b1009710fe70b80207a628a4f01c5e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=active+directory+pdf+file PDF link annotation
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8ec278c42430b485f0def1c62aaeb5d5/90725360261.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/xefumevisubekuki.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/kubup.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072d686149f4---tumoginekikusamiv.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/kowopivazezizab.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/dawidomivo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/lozonovovi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/33407772013.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210903174248.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e35abf18---70363446642.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/17933026980.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e9cbed08---muvixilomagiwakowidaw.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/22233754840.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/84547944123.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/bomikinolazumazas.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160737642707b1---gadiwe.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/10746172334.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/wozafuwodifigegi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe884ca0be---zefijaworitepuxuk.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210725230656896626bb8szj71vhkx.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d77cee4b---tivafutudadipemogefu.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xosozaxazolugubevuz.pdfIn PDF document text
    • https://maturana.cl/upload/file/75545063400.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2d286c3869f10d5530146303542984fc/mojejakosasovatub.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/55886166944.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae509c049c9---kuzozetep.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_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 10340 bytes
SHA-256: 0e631aeeeb82c70e4c8ad1645c16c28d86aea3b4f579f0cfc828076dbe313cf3
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 18196 bytes
SHA-256: 4d27d8eeae767de552ce4e1c9e3b463682efe66f56cc842a5c917c406ea9bdde
font_02_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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