Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40c0fbd7785e055…

MALICIOUS

PDF

97.8 KB Created: 2021-07-07 02:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20b4e63a6c11e3cc9efcf19079c147bb SHA-1: fa9de8f5c7849d07073353525701a6191ae0b22c SHA-256: f40c0fbd7785e055e3e9cadedddf02bf1d8b1e7f7fc92c3e6c835b31b2047d05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=celine+dion+because+you+loved+me+mp3+free+download PDF link annotation
    • http://playbabydoll.com/userfiles/file/7653723410.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/jijonizal.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/69fc9a1e35c702e07d2c309156fe0f02/29117797732.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/bosegezax.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/85300541332.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1733niv8odm9o3eugojmr55qhk/26398483277.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0087b6db---62190454418.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/37007714802.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/detutavim.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/87714654969.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/45788618846.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/ninasafivifamuxemux.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/714ab6aa2eacc82529ad458ac667c5c1/45192135364.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be89d7e2f0e---xowogunitiwesaxuvaramaj.pdfIn PDF document text
    • http://firegallery.ru/img/upload/1369107995.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160721031cd068---jexubuju.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160866cb010fed---73894326535.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4ecc7d1b---91917357072.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/04ad7159b6f9dfe872fbcbed8d6088d5/36454100956.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e2759a3da2a3bc504e5d99a127cfe6e9/fivujupumelurawinuka.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926d2ad8310---83217273551.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/36262600693.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/t6f0bg8j3ip26pgid3b0favpng/15570958397.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_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 11392 bytes
SHA-256: 8acdf42a991c6b70aacaf74bd85d4f9a02f22522d4ecc2d127d7fc51d3467995
font_01_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 20420 bytes
SHA-256: 2fd1488986a1481dbfe7fe6f12e9c55c9602fc1b02c1857a2c17a592e0eaba31
font_02_sfnt_off000161bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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