Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a86875d5f0103d7…

MALICIOUS

PDF

74.5 KB Created: 2021-07-02 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac60abb7d37ff2a8038f308055539d02 SHA-1: 1a28ab45ddc96139c04b278adda93e8770010673 SHA-256: 8a86875d5f0103d7d9cabd1a0d48c40811ac626bb53ea5636e2606839b8fb627
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further supports a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeed3204aa---moteporuxaxafagakifo.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b697253ac4---73238338631.pdf
    • https://alrukn.co/userfiles/files/87009032471.pdf
    • http://cuacuondaiphuc.com/upload/files/dipuwobelinabamemupojibu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rm2t42u9q501jm9dihda60b0h6/20589267449.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608367a518e13---biranekumiwujirolekes.pdf
    • http://agrobud.net/uploaded/file/donuvuburad.pdf
    • http://atomleasing.ru/media/File/waresuxura.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238cd3ef0a---lowenabumumewevapasobeno.pdf
    • http://briarcliff68.com/clients/71184/File/49402028496.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5kifvhp6e0v2enuans67j9urgl/10316794116.pdf
    • https://dolcezzecaffe.it/file/baminudivixofoxuxetus.pdf
    • http://aaaexpressac.com/userfiles/file/17600490489.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160902f8a03a79---lasazareniduwiwisatopim.pdf
    • https://steklo-shik.ru/userfiles/file/43863389478.pdf
    • http://stjconsulting.it/userfiles/files/tanimepofanutama.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf95b141e0---kiresosozavaruvukeva.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c513dec5---nowefijigusufiwiwerab.pdf
    • http://erfaspot.com/resimler/files/duwug.pdf
    • https://larustt.com/upload/ckfinder/files/7293378429.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6b2c0579---nukozajinusejudavubuxan.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/88e2fdf3e539041f2f3a7ad6d71849e2/18243993464.pdf
    • https://ytdrive.com/CKEdit/upload/files/84504965640.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-22/20210522163104765764.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/i5c29sgggntivuuuo0igmlmi36/7410047267.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+does+necessary+mean
    • 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_off0000c36b.bin
2ab2a5e6b9ccbed9139bb6e6f1359b1a06244d78774e8b6e82c73b48bb4e72f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 16160 bytes
font_01_sfnt_off0000ecbc.bin
ea83f6a31fefea8e25c3acd2019cdb33e9a18d72135d00dbe4b42bfdb8e02781
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10604 bytes
font_02_sfnt_off000104d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16792 bytes