Malicious PDF — malware analysis report

Static analysis result for SHA-256 d374484b59b30c8d…

MALICIOUS

PDF

85.7 KB Created: 2021-07-24 16:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2d57b75a07dcb612e96d1b7542b2c8c SHA-1: ac9497fcfc095545b29a92fe5491e99165cb4448 SHA-256: d374484b59b30c8d0718de3d39caa6252598e0239ff1ff6506b5884ababc97c7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41fb713b5b---dufokudijanenifo.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d3fb2f0ee96a9b3dbb220db40e30f086/dojivamog.pdf
    • https://airbays.com/userfiles/file/tejomebofodepawuv.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d304cf0916---fakupubexijowo.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/kibezuf.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a45c02c04---25667394646.pdf
    • http://getvisa.ru/images/File/74809517604.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/rezaseguditetudiwamiga.pdf
    • http://retroldn.com/userfiles/file/givozozujulisej.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/wajijiji.pdf
    • http://cnc-soustruzeni.cz/files/file/govupokekawi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/icgc28e8unb42bniven6h4btqp/55908681200.pdf
    • https://ebooksweb.net/files/file/47834200719.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/367190dfdbd69f54a6fe669d509b438f/najawenir.pdf
    • http://shuimotongyuan.com/userfiles/file/bibelolajorazutit.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ef6805cf090cd18761f7e413e0a56f9/biwaligajisobiwup.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/102080d4e0d41878ec146d995ff9bd33/xinori.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cjrvrhc6i59fk2lpcvpfk43uli/lakajizoboripijugebul.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f87393e87---mojebawaderilanifokenu.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d4b8012cb---bufivare.pdf
    • http://solemarservizi.it/userfiles/files/folidejibadu.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bdddcc5a4e7---ruwowuninolinaxupipakaxub.pdf
    • https://churchboys.org/userfiles/files/56342734253.pdf
    • http://amandatravel.com/userfiles/file/katefakaderifab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=new+shorter+oxford+english+dictionary+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_off0000ebcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
font_01_sfnt_off000103e4.bin
b1950e59540b72bffa5c72c4d548e7378be3d63aa0b07f8c826292b1420be72e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 11176 bytes
font_02_sfnt_off00011ddf.bin
cd9b72d33895ce90063c5b9dcda537700a09a4148b4389f37c5bba75c9320f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16684 bytes