Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b2555bce2f504e…

MALICIOUS

PDF

83.1 KB Created: 2021-08-17 17:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a25f7a0c472ca39c75a01667d83d48f4 SHA-1: 483a7a3519e644c5ce1d7da2fc49df6743814acb SHA-256: b9b2555bce2f504ead218d7bd577ed85a360678149c2567bb3a2b698f7e895a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other hosting platforms. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f8de6a6938656d16123cfa5b6e3a660/pokufa.pdf In PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/dawajozedurulufuwi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1102ff3c79e4bc6dfcac103193bc7f19/pebexujuparajetum.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd18cd0169---79160219615.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf504eb19a---mosuvivuzamuzirumu.pdfIn PDF document text
    • https://alutat.com/data/file/1615069959.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/53934066840.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/buvag.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/zeligipekojimefageg.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7fd345f9---gozafidefodovuka.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xomaku.pdfIn PDF document text
    • http://feast.to/upd_file/81266649698.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3041ee96---watuvesowuzolamekeximo.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bn3cn8uh4bum5cgpbu0880s3s/fogafawu.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95960414604.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a25a6ee1---65215847973.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/nidunobowuferemipudejinum.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/11645912443.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca897da71---93743037405.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8edbd4c200fb39463cb23e70f5ceada0/xuzulewonadufovugujefe.pdfIn PDF document text
    • http://teplospectr.ru/images/files/51827552148.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608522542380c---milogif.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/98d14aebf05bee48ed3d2ceed25be9db/2335679365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+resueltos+matematicas+4+eso+vectores+y+rectasPDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10760 bytes
SHA-256: a76e48970a60dbaa82fca58ecd92efe7a57f6b0b1882dc1bf8009efcec55d5f4
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 18176 bytes
SHA-256: c8ec9a04199de4d59c133679edc4d3df76ca2b2b53cf2e2ea5e8731cecb62e60

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