Malicious PDF — malware analysis report

Static analysis result for SHA-256 155da56c9890b711…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 584682f1e3db60ffde84c287dd8043de SHA-1: d5dd49eb806a3da1eaa3645ab0bd88b10053c23f SHA-256: 155da56c9890b711e094fe804f954f929a96bdf999b68402aa1e2bb51192286c
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosting files within WordPress upload directories, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification also flagged it as malicious. The presence of multiple links to potentially compromised sites indicates an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5561

Heuristics 5

  • 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
  • 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.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079262eeea87---zisametot.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/90669364379.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4c0e497a---5363242438.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/danatex.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021513115163654.pdfIn PDF document text
    • http://kaies.cn/upfiles/210610170052373612umtez0.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2e923249---21367123742.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f58030682---gajeleletipejirabofaz.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/memewal.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/31222873913.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/vafagimenokusiroxo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d504a907668afed94531039fadacba77/junela.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g0rt8qlrt0emo4blp3h75o5k70/logumiwalojazoxagewa.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/jeruparivivekamevaso.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/24936732919.pdfIn PDF document text
    • http://askort.pl/Upload/file/wobulesidifevaxi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b8965bd2---11408832791.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21efdd437d---81587475914.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/95810a0d366db6471286f6bd9bf727e7/60043510599.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/44744077756.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tbh8c65298crgtdk26konads3p/35792198084.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4acf626479---valakikererekazifomegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iliotibial+band+syndrome+pain+locationPDF link annotation
    • 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_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10880 bytes
SHA-256: dfa2e3cf7eef994c179cc3ea66abdc7314daa40019aecd4a5f447d10b2a529ef
font_02_sfnt_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 17388 bytes
SHA-256: c6bbcb0188bfff48be203974a94c22425f3f8c2b71108c7569ea10c783e02a78