Malicious PDF — malware analysis report

Static analysis result for SHA-256 865654b30e5a6b20…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 18:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fd1bc20aa3d72007bac646bb908384f SHA-1: 209f99cabcc500ace1ec861cbc470e4fb38adc92 SHA-256: 865654b30e5a6b206586655d8b6f1b55f0d84841a724643f63435b4217a92137
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised CMS uploads suggests an effort to obscure the ultimate destination or leverage existing infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=place+value+worksheets+grade+5+pdf PDF link annotation
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xekosozopuwagojasev.pdfIn PDF document text
    • https://digireg.sk/upload/lipizuguxuk.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c0870f8488d1c330dfc685bdee976ee9/68346676249.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/efde2f1dbd2899fe671061a396d6f844/guzosarabuxapuzed.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc049e1fa2---salupagavirelik.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e229b990e365d27f82b6eca925965f8c/jekigelujidelo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16080f0850e4d1---mepebobubiredoda.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6c6349e18fa591201216dc0657cfb9db/58619492956.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c377c34e07d---87090876550.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ujpeqk55p6st1slnej8m8db08k/sabugimivizovumibuzo.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/nesorekudareruj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612267b8d63b4---48344957813.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/49120504641.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160804ef2bc5b9---67155319938.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/56063095719.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38fb5385de---bemoxasuraze.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/buzewuzamikedadovoxewu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/70220524835.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/82108579296.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1qrp3vcg5prmu1df97i0mhrms/dokonamasuwumanobaza.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/963011927.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e01a1d158f86bc369300fd02bdc73dc9/93587424400.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9a0158b8b046275314c2a03f3e440f5b/8326428765.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c0811c954b723affe21c8da0ea69c56d/24624467767.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 11180 bytes
SHA-256: 67d304020856a2215ff02beb2e5cd8e292e20955c59a1a52354db8c78787219b
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 16400 bytes
SHA-256: bbc883a5d39baa5f78294d6c2f277ee0a9c9415ca07d429d95e6891d165dcd4e
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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