Malicious PDF — malware analysis report

Static analysis result for SHA-256 433bdfb21d2d5d4d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 19:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a6dd7db9afe7f84461a55cd4e2b61b5 SHA-1: 0504e489110493fe307647ffd123bb9c76cf9620 SHA-256: 433bdfb21d2d5d4d799ff2751075651c616113b5e9d9f481dcbffa8401f59759
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of screenshot lures. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 1 text block(s), carries a click-outward action, and is only 70 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 https://cructi.ru/uplcv?utm_term=how+to+take+black+and+white+photos+with+android+phone PDF link annotation
    • https://hirurgija.me/files/17858851583.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/gobefuvasavusuratabof.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/37888139831.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/doset.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb70ee761---nikuto.pdfIn PDF document text
    • http://industra.sk/userfiles/file/mosafemaberiz.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/dotid.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da28de6f5b---18812329796.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/61583278430.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/fepujaxikevowutapubena.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/17958980872.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/kuruvibi.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/84387714181.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/18421286524.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/12125919875.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kuxepokodepubavozibusizaf.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141824b5efe3---36667179916.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/80384881385.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/girojexunefuwip.pdfIn PDF document text
    • https://rintrans.com/files/wexuvasobe.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/nedivisokumuvonidugolewu.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98053088408.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/kiwagojerodibifefogegul.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/39584919604.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/zajewadirok.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tafabovuduxa.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/96653411516.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_off0000b79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79D 14132 bytes
SHA-256: 3d5cd44034a81d48a5f9fee7be35e6e19eabe9cb5c398b223a96cdf94efcc9fa
font_01_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10920 bytes
SHA-256: 9ff4553afc33ee81900a812bf178ab325a3c01da53c2228fee254b5d2e13a1ad

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