Malicious PDF — malware analysis report

Static analysis result for SHA-256 5179f91b3208535c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 12:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e8659c695ebdb04f9b638c51bbabb39 SHA-1: 0d19efc77bde0bcb36e1e28c19600f060124724c SHA-256: 5179f91b3208535c0ce89fe3f100bfe0200153adbf66737e8df4e25e52b1ed6b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to host and distribute links to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=how+to+take+a+screenshot+with+note+10 PDF link annotation
    • http://iccjsc.vn/images/uploads/files/rabawisexijor.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109060432108879.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/25312482117.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/zavopadosomitemaje.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/38131124551.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/27024071071.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/setipanijexolufegu.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_065436.pdfPDF link annotation
    • http://toflight.mobi/attachment/ckeditor/files/2aa3886a727b166a27c59bc616217df1.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/49564127527.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/25053657376.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/dexosobazefudekixob.pdfIn PDF document text
    • http://hingliltd.com/userfiles/vexikitijusojanigiw.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a20c6ae7---mikasekokapinoluje.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/68095579816.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/72119120293.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/76483478521.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/lenaji.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/99930002428.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3869f6f6b5153e6f24b37b20a2df981/roxijozunuxabuzatoki.pdfIn PDF document text
    • https://oasis-travel.ro/files/lofinufinodojesifebulivo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pb6l2pfcani4cclb0437338l5n/10468964250.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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 18332 bytes
SHA-256: 62ab289e52566200c740d330bd86d47783f682b08cff744160757a3e349211e5
font_01_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 10624 bytes
SHA-256: dd466bb789791ae323ca0550788a212c7256c8f46f05dc4a597d2b5c481e7d7f
font_02_sfnt_off0001316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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