Malicious PDF — malware analysis report

Static analysis result for SHA-256 42566e43f7df34da…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 04:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22f39a6a864c8417ef824946df74eaf9 SHA-1: f73315c7cbac8fa75e9bb4f167ba7a29e808fc79 SHA-256: 42566e43f7df34da43e5e7910f994ade4be9f2c12858b1add69ecd0bf6e26e03
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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 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://smidgel.ru/uplcv?utm_term=flutter+api+level+29 PDF link annotation
    • http://geojeoceanhotel.com/userfiles/file/20210914012905.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/27565581308.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ef22b9ef---wafumode.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/71685554959.pdfIn PDF document text
    • http://parfumland.sk/upl/bawibanoxaxoluv.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94897674408.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/5188139280.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/sarusizupegebebosozed.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/63582426228.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019ad4f72d---68980008772.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sokekatalumosowu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/moxefigefapuzuzusiw.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/66562561318.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/sorojudezogogu.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/26638155545.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/27113826673.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/85037187239.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/18972225743.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ea3de45e90b244c1a1d3791fbc81951c/ditaxugeruwubuw.pdfIn PDF document text
    • https://tarsiman.ee/files/file/24913218182.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/mevorasu.pdfIn PDF document text
    • http://bushurov.ru/images/files/79777343884.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/gonojube.pdfIn PDF document text
    • http://tion.hu/upload/file/53234200447.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/79152132233.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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10284 bytes
SHA-256: fe550b2f74ee54001eb8e8e18ce0196648dd3df5009f3e68bd605782d1893f89
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 17712 bytes
SHA-256: 73cbd749ed5b0d3004f4d655d610cee58bc947e77e7c4f4d35eb812a6513d215
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1