Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fda721d47d5a77…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 06:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f53b9ee3337147b7fcec78fcad5f9ba7 SHA-1: 6aa681713ad6e3a69be337c944b33d6d54d116f5 SHA-256: 39fda721d47d5a775514469001eaf7e865a8335f00c1d501ff274e9bba76051b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://www.anieliasfx.com/uploads/textareas/file/wabelafabel.pdf In PDF document text
    • http://transporteslaplata.com/imagenes_web/file/70060370541.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/defiso.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b807ee277---36984430855.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/833ae73dfa52591aafee69c297ad796f/34330993708.pdfIn PDF document text
    • http://eternoohydro.com/d/files/silos.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d33e6420febff87ab2c41e4d917979fa/faxenixulevidazapuju.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/80396081868.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/43206360268.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/d66d6fosm7f1sddml30anm8qoa/kozowapetezixokis.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/3007286382.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/tenakabugaferi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6e55cfd30f65765dbfa1db43f9a9b276/fimopobikewojobagu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/botugevaf.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kebogeroveda.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9o83rq7h2qag5subo7kubrk02/68606862750.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/zigifusilu.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/80205868883.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/19771493421.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pepasifisotexokipetaw.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/62122310980.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/61733000261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=effects+of+drug+abuse+on+health+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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 11028 bytes
SHA-256: eb0a4b8836472b1224c28e646ecfcaf45c79dc8aef7e6bae776484426d9dece6
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 17100 bytes
SHA-256: ce26994909c92d7774e4e5ef8b7c4239c7166b8d59efcebad489daf9ae1ad2b6
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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