Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f154b18cac16bb1…

MALICIOUS

PDF

73.6 KB Created: 2021-05-27 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aada51ea7deaec9e90b2e41ed40c9ce0 SHA-1: 99316ba062418726fbe992d5c16de9784c84a34f SHA-256: 3f154b18cac16bb161cb472ee60dddb900cbfcdadbd663781de488cf98bc2df9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4b4f05aa---85259875500.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5bfc6a39acb071d807f6246cd711ec62/tumiwedisuneraxobun.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e3f707afc242e39baf3cec592956b3b4/42181251822.pdf
    • https://cafemocion.com/userfiles/file/91111068387.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf17fb70f6b06030f787fe32a01b16ef/74004211929.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7341b6a41---zetibopuragosela.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2d2681f58e2db25148594d86dea3685b/62637230570.pdf
    • http://bet-balance.com/userfiles/file/lijafivuwugage.pdf
    • https://banghenails.com/upload/file/gapurejesuwono.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a20k53otgig4686bmrd31fdsds/90245314507.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/18813461906.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cbvq76i69isje5rb1fd2aunmk0/rububukobalipedavorotazij.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0e5ef8e6---ridepipevewegifetelel.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/234741d4535cc247a52f2c3849dba71d/sunenaturinisenojukidopo.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14203657150.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u5kt162lp5kfdajv8r0qnt7k3m/dodogosomalufagejanopudax.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9b16f9cb---67350104518.pdf
    • http://ubest.ru/images/file/81732328923.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bahubali+2+filme+completo+dublado+online+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58e.bin
402470b1f29a34a04fbbc5f6deb78ebafd7e74c9ff64fcb48e6785011d9f15c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 5888 bytes
font_01_sfnt_off0000e96a.bin
d27be980893c35faf4bdf84104e9cd98ca75641bfe4de2464d52b4ddcb9a9ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 4008 bytes
font_02_sfnt_off0000f8ad.bin
165d35e9e4510dd8d5a2a387ade780a75cd047dbe4974e3c0aa9a1dc14a65af6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 11424 bytes