Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd8274ae198e35a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 12:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6475479bfb9d4a4af39f824e5619dd6 SHA-1: 4f6781f5f0247c458f0eea02a604ad8fe3e84992 SHA-256: 3cd8274ae198e35a3f232ba656d0e95322cc385c2955126878f73dc47b7440cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a significant number of URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm intended to obscure the final destination. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://siroyensao.com/upload/files/fabuzoronalib.pdf In PDF document text
    • https://altstudio.be/app/webroot/uploads/file/46817431840.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/roninulenodarupogipus.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/90477849856.pdfIn PDF document text
    • https://trystsalonri.com/images/file/sekenuriwidadefefagavi.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/gikib.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/5634883578.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/jutupufakolowosonawajufej.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/tetewenofusudekodujowex.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/matofo.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pilajuniluwalopimusuwejiw.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/50194292909.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/obkgucd8m18gch62gir264a99g/megubofuvizifojef.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa0fae872---37391862495.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf135a463---665805171.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rafefogejamugoluluwexiwa.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/80915092012.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/64499092241.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/18050121634.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/xaladij.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wexirafavegimozugo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gafomelizopalopamexebafa.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9f5fb1fb4507d5a40a7b3748ae083625/domulajo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/25014455419.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613251eeca144---dozadoturisomigam.pdfIn PDF document text
    • https://rcot.org/userfiles/file/lopupemirawafomixijutug.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/12473209575.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/54684687104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+lock+recent+apps+on+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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 10676 bytes
SHA-256: 5307d9ddab08230b56168184b3197fd3b60228f9a5e877e1c5edfeb37b25be53
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 17472 bytes
SHA-256: 3962b8c626ba180445a12d397e1632e81fd66343f0989b54f5228ba8279b6e89
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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