Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd24c67e5656cf48…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 21:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a27c9619b22d5b7ff08fe15b320f5db SHA-1: 5463b24396b89e99a06664152a4379a20441fc7c SHA-256: cd24c67e5656cf48a1eaf8932e385272fdafa855406b1b52f42c0c740186d668
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://euroear.eu/ckfinder/userfiles/files/56401341970.pdf In PDF document text
    • http://katyababash.com/images/uploads/file/65001907277.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/wimifoxuguzuvoxazabusebi.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202108170848355528.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/7820987540.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/g87pbuh0sfedfmaookd4ebs10j/julenoxumefebumobid.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/62859102272.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/61694574772.pdfIn PDF document text
    • https://krossi.ru/images/content/files/valudanofobebokimidagu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/debutowufusim.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/4231542546.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/28599341260.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210530061007.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d18046ef1---zaxosejuzedudutojopib.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bnmd5hihaq2sai1f1rgd0hrue1/towibawuwi.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/rukigak.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/32eed22e3c153395d294d8f80562ff1d/palejelekukimiduzovonuk.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/77910432528.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/38135791050.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/sepasotelepoz.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d591689a0d9795aee8f58181aa6d74d/23006111442.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/58324022361.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0cf4ae9913c00b10917c2d8399717518/33814804619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=common+assault+no+evidencePDF 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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 17276 bytes
SHA-256: fff02c2fa2cab1ac8fd1a26c82b4320908527ae55f1da1f2c0be4775a8049846
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10628 bytes
SHA-256: 6f628d152336b8447594a13c9697265d566672e8922e8a85f4bf54090ee14716