Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60f8d97708975bb…

MALICIOUS

PDF

87.5 KB Created: 2021-07-01 21:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fa488acdda4626c617c269752f2e9b0c SHA-1: 3616f3e9be7b5e3479677dced10d2a0c5ad7b70a SHA-256: f60f8d97708975bb1984e26fe8fd8d1a3de662d092350839dfe469d463f4e031
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://inwebjor.ru/uplcv?utm_term=adc+hyper+carries PDF link annotation
    • http://xn--szabowski-tub.pl/userfiles/file/2002309953.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/97659895573.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sk17b169c9792nvjv2uslq4er4/31239152403.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/24234925291.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/63151204295.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komabetewezolunuw.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/72523278035.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/44782981371.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/844oqr1a1fk0mjcis2im4btit5/werugikururoselaf.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3afc91f012738e6da309034ce30c480c/57234355854.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160781ed81a0c3---20522091728.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o2enbmnr9nen4p9bg66quk1khv/bofarezesulerowimivowolo.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/44176375850.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/lonarukugimokozaraz.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jesoxibifot.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4692c3767---88785511868.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69282517384.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36690b2ad---bimemiji.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/4042590208.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f62a9c926bd5c015329a1ac0f5d2ac46/12728600574.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xolenujux.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083457ecfbfc---kuvunuxuvav.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/542ee70c1bbfe81dff11b31ce5ab2e79/bowinebelaxu.pdfIn PDF document text
    • https://ferropula.hr/files/67441743699.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/78380900304.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608745852bc8d---85975623155.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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 20564 bytes
SHA-256: fe4e6f51fdd89cd76f7630088cb740f7a393c2db9326419d790df63053da5038
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 10336 bytes
SHA-256: 33c8c35f14408cfe10d77aec1a055a89c7f1c3c68abb01dc3db9b2544ba8021e
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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