Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4923c520a6dc0bd…

MALICIOUS

PDF

148.4 KB Created: 2021-08-14 15:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ee2cfdec682942b289bd4b725aff780 SHA-1: c32e6dd28bbc1752a49573241af569426b5bcfe2 SHA-256: c4923c520a6dc0bd6037bd39ac0a83a9c36c5a5736a7dfe250a08070bf0b86c0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://www.jokilaaksonratsastajat.fi/file/lunibufotib.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/jaruguvajejunige.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/96090479830.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/17f444e46a151010f571dacade273fbe/takedikimesisivodi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/tezixam.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/saranometuxogotibuketo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xexevake.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/kudupimozegitupezopubugil.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/rokukarezasalowudas.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16103b34d86846---3852092842.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b297ffd6---tekeponadokesabizovifogi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/97620357464.pdfIn PDF document text
    • http://amdind.com/userfiles/file/4046030779.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccba450ef---zivogovunaz.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210619123242.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc18e05293f---musutisugivoduvevijodaram.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jg20n18hvefiodnokmc0l73ppd/jakesizonugeromebomubovor.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d868686b403---winigilunenokefitumuse.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/kotunerisikunizexoruxusi.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/zononubofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915e357b709---ralanuwefusep.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdfb88b88---ruzuz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/80999736d8bb9cee82ca996bbf83a745/33878795591.pdfIn PDF document text
    • http://usagimatur.com/files/others/31641254909.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/19733369527.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff4bf14307---mozijubomamulonotepepotew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+contest+of+champions+crystal+shardsPDF 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_off0001cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E553 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off0001fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAC0 17968 bytes
SHA-256: c4ccbe283630d188c755ac702418afb1623df05cba0cfab460bd21cda2109514
font_03_sfnt_off0002292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2292D 11060 bytes
SHA-256: 59d5eafed0198cd335715fbec4cde53475de731b901673f9031d7b6c765c1926

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