Malicious PDF — malware analysis report

Static analysis result for SHA-256 198eed1333e0b5cb…

MALICIOUS

PDF

130.2 KB Created: 2021-08-01 17:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aff47209a181f502ec0af53399155261 SHA-1: c849c94eb5dfbbff79eae8b33d88aa7035a54064 SHA-256: 198eed1333e0b5cba1c5bdba26b9ed0c82bd32faa5413a82862191ecbbe0a807
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads or disposable domains, suggests a phishing or malware distribution scheme. The document likely serves as a lure to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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://smidgel.ru/uplcv?utm_term=scavenging+process+in+2-stroke+engine+ppt PDF link annotation
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/80957433235.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/nukaziriguda.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161037fb8396c9---zugelukoretawor.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9e103799a50af040260736c3e05363b4/98065478289.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d90685f7---vewenujamemubuvur.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28f5c30c2---95289074436.pdfIn PDF document text
    • http://iviltra.lt/images/files/1998945757.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/0632bb9274a07729bc81910a0aa336d5/85904556722.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vinutotimozepetafa.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/dagodup.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/widoxomirebes.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7odeqtpsvoomgbmn6o0c4bjqi2/54856100800.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f033ae7d---50038696941.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/93506823134.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160714fb715465---87096324918.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca0db2922---fopuzorigowigepefel.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5lgbs5s65tisaec6c1hegp67u6/defokuvuta.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0454ad850---farojerupimulisivu.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/naxofejinumilawovaz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c6556d365f39eda8577b0befe3da242/xuwatajorez.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/2597624950.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/11440849170.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/834e824524a57307a2e9f563b43fa713/51780802371.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16072b273a0e07---65919723466.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/vu3g765lrocjjm0eue1mvdkgp5/73818987012.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_off0001974a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001af5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF5C 18652 bytes
SHA-256: aaddafc5469e89bde705b90e61f8ab9db8d63f6accc8a306c1c150da7eb4c0f5
font_02_sfnt_off0001e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E11F 10892 bytes
SHA-256: dcd8051e9a193c490756f7356af1d9db65da1ff2846a77bdcbe74d4e888405c2

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