Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b594524d94f589…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 07:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d679dd6e515c95ec222b9e1b603a531 SHA-1: 44c838251fe10158be62f767b4c3e7fda76f6071 SHA-256: f1b594524d94f5895764bf54b5dd1a471bc438686f32c6a4f4a2bd3dc375a5a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://phuketdriveschool.com/userfiles/file/jexurigo.pdf In PDF document text
    • http://prplus4u.com/ckupload/files/votogo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cac3ed290---14099442230.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210906143804.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/marepurugejixumikunoza.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/genugadosagudelevo.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/63337200303.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/89326241245.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/nofamabuwuzitikinivoge.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/50238881372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135357b63958---zasabapid.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bad84a05---wujajegixowuwenekizave.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f440dc602b---9275326092.pdfIn PDF document text
    • http://preiss.at/upload_files/files/fosuzajurufufujiremuga.pdfIn PDF document text
    • https://jurad.eu/files/file/dokumofusazatovu.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/73738302275.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/13945325586.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/nelosejikuritek.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/kidorinaxa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130042f05ea8---14463811114.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/wafepolumaxajukoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fall+guys+ultimate+knockout+free+download+for+androidPDF 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_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 11188 bytes
SHA-256: cd1b01579006ce654c67087dd1db234b5db93562840d8c9e9572b6d40cbb1ab0
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 18376 bytes
SHA-256: 67e793a49a2e3a007655ddeb55c1b0be85a8fcb775dd4da373162d08e92727c0
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1