Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e620f0c4ea043d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 089d67874ff9ef97bb23d11e3735d561 SHA-1: be544d7b96538f5d0bb488be60409d88a16f2064 SHA-256: 03e620f0c4ea043d6a5069a65e7054356507d588e961ecc411485f58e92f956a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://pistant.ru/uplcv?utm_term=all+the+types+of+lines
    • http://coaching-scolaire.net/userfiles/file/dipapigipiludinapa.pdf
    • http://goldartline.ua/userfiles/file/difiveteto.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5852eb2e7---85110705123.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a369d0e1d69933ec359eee03721ff969/lujibunabosaged.pdf
    • http://agro-vostok.ru/userfiles/file/muzivotozugomasuxopikuvo.pdf
    • https://creteservices.com/FCKeditor/userimages/file/656938516.pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/45374414131.pdf
    • http://studio-castiglioni.com/userfiles/files/62019067168.pdf
    • http://przyrodnik-kujawy.eu/userfiles/file/fedorizofukiparinenebafu.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5712d6b07099e77fd19639a68c4789f6/mojerokifejubisi.pdf
    • http://chemonova.com/FCKeditor/file/kavis.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/mivipinaj.pdf
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/fogetazugewemo.pdf
    • https://isosklo.cz/uploads/27765784320.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412fc3c6f3e---21523421465.pdf
    • http://mishelik.ru/userfiles/file/nilivuvenupovusevonev.pdf
    • http://canhtoanland.com/upload/files/74025677004.pdf
    • http://seatraderhk.com/userfiles/65061670479.pdf
    • https://tutorsbureau.net/userfiles/file/lopamalejoz.pdf
    • https://jagamimpi.info/contents/files/wezulitatam.pdf
    • https://safetyhanoi.com/userfiles/file/22137320778.pdf
    • http://thehbbq.com/uploads/files/16185427726.pdf
    • https://riolospettacoli.it/filesUploads/file/50482512737.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/44598017189.pdf
    • https://comfort8889.com/upload/files/webotes.pdf
    • https://egyptsuntours.com/userfiles/files/58414029806.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b378.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 16792 bytes
font_01_sfnt_off0000cb8f.bin
cf9a9552b843aa32ea571dfd66c4f3a2af34221d5db0ac3b47c222f2f1b9b4c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10288 bytes
font_02_sfnt_off0000e2b0.bin
88de6e340443172ebb7968ce9f941035a651125159908400a07f9c16d112e4c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 17048 bytes