Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65ea6859746c9c0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 13:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7334a6bca0fe76e7475f7352b55ec982 SHA-1: a6f2f89da32d79f60b37a94089f145dc83a4af8b SHA-256: e65ea6859746c9c08364e5907abcda71c7368172bd72efa566f37a9022e08fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 numerous URLs pointing to compromised CMS upload storage. The document body is heavily obfuscated, but the presence of multiple links to potentially malicious sites suggests an attempt to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd96f06054---73808312886.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f3442e96---35732916148.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/11732809440.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d9edb4c4---fimidegategomikol.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4c0a8dd93d836f06b8083d86a55b4505/taxitizomobodaxom.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165bc1db11---zafamofex.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a01efe82cda---88506699900.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rl4t4jeadusfjssdv6oo5lcof4/25827229971.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc053686d0---dokadorobuzabedexa.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/5221590293.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5f79d8aa---94960951332.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071404240473499.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78644786696.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/54434233029.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/zugotolizot.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/31909390407.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/bonipesoxazogosaj.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/6315354155.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/19433173048.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/itkvenkst1hnrm3r5kfnog15n2/wisomedekonulomuxeb.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/294d942198d5486d054f83df5ef21312/82428410495.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/butalevo.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/71996949875.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/todupos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=communication+process+worksheetPDF 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 17784 bytes
SHA-256: f6ed45c8d9f39fee5c59e894469d49b38673ff42f80e0c9e0eee18ad2cad826c
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10904 bytes
SHA-256: 615dc82f2002a0f07a1aa4006084a5650e02e06f21d62e423876d32eda609cb5
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1