Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea0810f00ec93d3…

MALICIOUS

PDF

84.3 KB Created: 2021-07-04 01:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c9d6f7bf7066f8f871289259a395492 SHA-1: 4a5271bcc494e6d7c27dd030ccf813311b3e710a SHA-256: 8ea0810f00ec93d3214f89aa9113d71fb9aa20ad189a584eb255ee3dd69fe7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://dok-vo.ru/userfiles/file/36593410322.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fda4a5f85---zeritolofejanejokojubafi.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/0e6e459e4d5c9d16d5faadf05c4b84f5/48611370234.pdf
    • https://allcreaturesinc.com/files/files/tidadu.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5lci7a7eqqg2dfbcijs7c8mtof/99381989989.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3052be17---sofasotadejulegerom.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b465e47866453945d2700e54cc8b90a8/tesipox.pdf
    • http://nw-line.ru/generic/uploaded/lufofogodegevitawisaw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094435caebef---5474878263.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8b39aafd0fdac5d9da827db299a5150c/wimagepebegajedusugegixe.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sd0ibl12u115jut77o49at64v7/26041840221.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160728d99c7c03---14359472245.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/gitibolusurumutox.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9ca3e0c0---81932119575.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f5065fb386131680baef098ffbd6a298/10010030779.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/83189957958.pdf
    • http://beateromer.com/bilder/file/4898215462.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2f4467ad---vamagabajepotad.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/enllr8ekjn2kqu493dfoa82va6/jajirizevalugugiwul.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/r40ckk1buu666e1ctaab6lia85/15920238522.pdf
    • http://www.vikingmaterials.com/img/bimebipobilij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=calculus+2.1+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56c.bin
676df50a5c7b2a13768643d09f1c1a036a2b97ee20cdf5be62e34824ad0c4654
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 17812 bytes
font_01_sfnt_off000114af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 16792 bytes
font_02_sfnt_off00012cc6.bin
3e49864c515ccd17d2043f479161a29a4a21e8edd623a26951ec9ac5e7694326
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 10368 bytes