Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b7839497eef1a9…

MALICIOUS

PDF

84.9 KB Created: 2021-06-13 02:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fd581e10804736adae1cfe7265dd13ce SHA-1: f21cdd688e46143568c9fb5a514cd2a57b785817 SHA-256: c1b7839497eef1a95a449fada577288ee5f4887cf3aa22f8c55fc0730ec37a31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Apa style reference in word', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=apa+style+reference+in+word PDF link annotation
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806b47919f4---7914674394.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9664beb69d416f02dd189ab779aaf882/dixikemedapixa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727ef56631e---70576322918.pdfIn PDF document text
    • http://accronline.com/userfiles/file/34088642086.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609340880f77b---xixanuzopub.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/654t1620r2lti8d24t3gjdg5m2/27432179777.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d574a7064c---84195941926.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/61165853664.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/takazodotar.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/nemumiralivelanefijevok.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/97575f1031179e4cd833394bdbb540ba/fifivogis.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/11207124734.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc9615060---jotupikovefakumizan.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/kewerivamasasusavute.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c78924f1eb31bff4c0a517d215cf6eb3/tutebujokure.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/aa703f074811d896ca09f64a62303475/25837619222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 5332 bytes
SHA-256: 5c1e604db67e65a317beccc975f98601ae8cb06c9f79cdf3e544cea8f10cf6df
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 10808 bytes
SHA-256: 09f6beabed2d9bed0ce3523442d71eeb3af4d1201905de13b38ae1da36dd9180
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

Open this report in the interactive analyzer, or submit your own file for analysis.