Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca8059b39325550…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 04:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b48ca79a86d9625bbd56a11ccc6c2132 SHA-1: 7fa3a960e2d08b152c7ff4dd99fe6edacc09eecd SHA-256: 5ca8059b393255509e709c48db1a6f21fca7ff28ee283558028944ac524d8243
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=social+networking+websites+pdf+download PDF link annotation
    • http://quiltingacademy.info/fckeditor/userfiles/file/dajegasuwa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd355e661---27041583625.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bdef7878c370d582120dc3a29d2ec97f/58931603636.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a094d3dcf9---feraginiset.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/07dm7pv0ul30iq2tqmufl7gpcf/sasaxinarubujumip.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76d868bb6c---salofapaberaginuvexilena.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706bd54b78f---647409343.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/42769907824.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/41049682689.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9f4bffde0ebc7c136f6bfd34543775af/6266433910.pdfIn PDF document text
    • http://palami.by/images/file/mimubexujejuxafuvagab.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4f2965153---30407719934.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f5cae705---zidotadizokerasili.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/11423606559.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/panugijidubati.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b4bc5fbe61bf466a9b8905331aa8f098/37460533871.pdfIn PDF document text
    • http://investkwik.com/userfiles/file/51572630029.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/lude2i5enr13g7ov2u6ar0hgqr/293350859.pdfIn PDF document text
    • http://school15-tyumen.ru/f/10766676641.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/g91ntq5oha3hdoftj3smck82nq/40669298080.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/34378867532.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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 17164 bytes
SHA-256: 9b95acc177d931692b861dc49016d7148b7479f2b933338871031c3a4ac3da62
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 11188 bytes
SHA-256: e9dd0f9f46d4359dd039318f41b444c4bf770cb550f1df4da15c5ba56df84d66

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