Malicious PDF — malware analysis report

Static analysis result for SHA-256 19973b0c7760656f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 16:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bc2125b402a18b932794528a77bdd76 SHA-1: a7b8ee87467770639d5ed71777edcc7fd205df4c SHA-256: 19973b0c7760656f40ac663665da68a352170a6023e60d4beda016f373ef1bbe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable or compromised hosting is a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7pdo43emgvgb9rmtbmsqr87iu9/dajilulujoxozubaripez.pdf In PDF document text
    • https://homecareangels.ca/files/files/files/komexanon.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/18122424034.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/q610re7ihfdshopsc2cstdps11/vibekinudixezesatidogid.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/zixidivalos.pdfIn PDF document text
    • https://go2germany.ru/files/file/vanesakutojovoze.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/82261400588.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b8aeb8b77ec75a056133dd37515f6dd7/puketarusatijapebop.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/89855835921.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b582dc7694183abfd2470a0f012ba818/nebozi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/s32miis65vptdp1m042ii6rf0e/11672031932.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/48930336490.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/365120486.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/4008497273.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/fumakafilowifowonotoxuj.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/046eaf98d42d29801aecb1f2deb7c47a/direnaxefigulijojeneli.pdfIn PDF document text
    • https://lordpin.com/calisma2/files/uploads/3623002067.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5bea12887eb8d82bf0f471b4ace319df/29117357941.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161250d250a718---zolegexemilogorokon.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56c0d41e6---mijom.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81d18daf9---momowagirofuwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=senseless+sentences+worksheetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC444 10328 bytes
SHA-256: f961b60b45aca7863006d611c17d0a6cc2cb2a5817e034945c3dd03d52a32c57
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16596 bytes
SHA-256: 2f385028dd5ef0aa369738d2c43c6e5e459b01a017ffc2fb21ae5005e3c5ea24
font_02_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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