Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa21707be6004d5…

MALICIOUS

PDF

67.9 KB Created: 2021-09-10 00:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc44fe9731600c9ebd36b193f1d77c18 SHA-1: d93c701cd45459810e566d1f81999c04a3481a90 SHA-256: daa21707be6004d56e763b002a8b54efdac295331565a709eaa4e0c3371b3bbd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The 'PDF_IMAGE_LURE' heuristic indicates the document likely presents an image to trick users into interacting with a hidden link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://snabsz.ru/ckfinder/userfiles/files/nuwevuxujegepesudexa.pdf In PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/rarifepotaxas.pdfIn PDF document text
    • http://www.pvvc.cz/files/vuliz.pdfIn PDF document text
    • http://marketingnews.fr/images/file/91057118285.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/94845031019.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/wolopoxenozoz.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/25500859727.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5fa9db92ac6d4b39018c64c7df4911e9/84667832169.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/xasolasaxatududox.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ca624b348e6b1011599c6563dcb9e9ad/kipimak.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/fugetirofolesebevujudabo.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/tinatob.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/60969231658.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/66299951277.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-05/6ae7d901a7c29c1bce0ed36466c1a30a.pdfIn PDF document text
    • https://krossi.ru/images/content/files/nagoxidipuvu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/29eu04i2u54t7ij6i7drp4sebd/motirotaduj.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/komerakofame.pdfIn PDF document text
    • http://crediramasrl.it/public/file/dekofodugedup.pdfIn PDF document text
    • http://hmed.vn/upload/files/84459514584.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92729008749.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/16801626925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=linux+command+line+tutorial+for+beginners+pdfPDF 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_off0000ad78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 14372 bytes
SHA-256: 7826ee581d79e40161976b422337a4d9aa512bd99411ca764e2a826dacb20647
font_02_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 11260 bytes
SHA-256: af88327115860c1458bbe25cb876fcd6bf2ca5d2be9fd8fa8de5aae3271b6017