Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b90d63bb44f6f42…

MALICIOUS

PDF

117.1 KB Created: 2021-07-30 13:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcb85e9465ded6477aae28eff3c5d00b SHA-1: 3d32f6f46bef1f576993d17ee80b661c59e2bba5 SHA-256: 4b90d63bb44f6f426f3fa86bebc490fa7404fb9c834c05a790559f8042f2c5b0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which host further PDF files. These links are likely intended to lure users into downloading malicious content, potentially leading to further infection. The PDF structure itself is heavily obfuscated, making detailed analysis of its internal workings difficult.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7530

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maybomchuachay24h.com/Images_upload/files/jimadewujometaruja.pdf In PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/27046288486.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b880c142b0bcb3a97ca3384a03709e33/povaw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9j918dd0vi95vdfkgrprmnrpg0/20479968921.pdfIn PDF document text
    • http://robedecreateur.com/img/files/togilozak.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/83899163888.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vamugetajipudirenid.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d12d3b05d75b21448d79fce12eab35fa/82854757723.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071feca0e3a9---58061417431.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609837d14d9d1---12608661494.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb52a4d64c---42176129056.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2d9640837f7ee89ef4da58a525a37739/xapuzavelivalegujalaroju.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f30d13f05555d8afbd553a0ef98d1d72/62292814888.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b2a61d25---zemovoxakowixokiruzu.pdfIn PDF document text
    • http://kaies.net/upfiles/2107160153188658963oxwpg.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e8847f27a8ed9cf0aa23c9a0ac50239e/lotebeligefesojobozimik.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715746bbe49---45042168728.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/10290367524.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0c5ab713d---bazexarukomud.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/39nsih5gaead2057so85s3te9o/jurutisidisepokefixeti.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29a2a1188260af427bb640da521d46f8/46723855360.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fomox.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///29837604827.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/15501155675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=propiedades+fisicas+y+quimicas+de+metales+pesadosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC2 18772 bytes
SHA-256: 11859dd79daeac46f846768b67600131c2965082d4e076c9a13a5c6b83594de2
font_01_sfnt_off0001bb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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