Malicious PDF — malware analysis report

Static analysis result for SHA-256 c741db81a3c64f22…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 01:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 889ff90e40ec64b92fb2c8fc6623dbfd SHA-1: e2d84afe54b16f3e7500b53da489b66dfd700c78 SHA-256: c741db81a3c64f220cca0b05b5687a2cefa0bc653a068cc8cf5417925521c773
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ClamAV and ML classifiers, containing numerous links to external resources. Many of these links point to compromised WordPress sites, suggesting a phishing or redirection campaign. The PDF's structure and the presence of external links indicate it's designed to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 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://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/17eb8e237fdc801ae389601649f8d555/64421096494.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vdjg98jqf1758i1m5i964qrt01/29867295002.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78d6a1747---9918355375.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/99424074361.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6e5c2f951094449169727faec329f839/84168930745.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/k4gnsf0pv7kjsp4s653sq3v852/61786326113.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/72934373327.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d175684cd57ef43c44017c06b22acf59/dikezagudete.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befb2317ae---67327316500.pdfIn PDF document text
    • https://mahae.hu/files/files/35136388370.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/212b7e91e8cf45c5b221e7510be73c9f/naditivovapekorabir.pdfIn PDF document text
    • http://anpo.vn/upload/files/piwekorutekuzur.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/dozabifevoxetetepi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/oa60et894uu3vv1b9bf43uqb2r/40162703907.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160739e16352d2---xuvisezeravadifogalugali.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/6209685157.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d32c23e3---bizewinijofusovugojexorex.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2cf4eae09f1c0eb973d15e2b0b05c65b/gikabojekasu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fnh6tgfihue8ldjnhu5vlf22so/70397594817.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/28434197676.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210606_2159D281896447D8.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/2133177259.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/logadefirafumuvusapu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1a7c54d1d2f0cd6a6b293256d1f95a3/jelusodesojul.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc8440419---27641774699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=latex+reference+bibliographyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10904 bytes
SHA-256: 16baa74d6d4c5b946eb144e43a6291e158ea06209c7e42f5d5e4ae61e93cc028
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 18136 bytes
SHA-256: 039faaff760166d359ac8fb240ba98e4f40aef048e8eba985564cec5ee23608a

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