Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b1042966833839…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 21:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1cc52a30981187f3710fb6e5e461cbb0 SHA-1: 630224654ce8448deef96a0497553d4ec46281fb SHA-256: b1b104296683383950c90629a4c7fd63285451ea3d013d9f8da8e8bf5e36391a
156 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 numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a link farm on potentially compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=winx+club+bloom+and+musa PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/18e40e86df908bd0b708642dd5b720cc/7531625984.pdfIn PDF document text
    • http://chpcentre.com/files/file/gukeraxepekuj.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3mb86gb2u34js9ooij5pbnn5k/nowagere.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/p4u0vhn3mn4lglo1g8li5brvr6/biluwurimu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/955114ae7ceb7334f8437e95eaeb8ab5/fadamevofirezukuxaku.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0e491325---vugarugudojemuvomizefiji.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608909c7b8f70---rozosupi.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/gejusasuvupuwu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/fodutiwivasupo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9efe5f261870b8a5cdb767d3e5dbb02a/42215983245.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pelozojaxeduroxikawajeb.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/20942290428.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/56483524302b92f0017029adc8d66e60/tifegujonowixejazoz.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eee3a1450---bamud.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebceb9276f5915c35b42edfbd2e83a/52392836886.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/95369209181.pdfIn PDF document text
    • https://isleo.com/i_photos/file/kelemuzemexikiperifasik.pdfIn PDF document text
    • http://beateromer.com/bilder/file/dosuvulafesazug.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/05f3025964cb8ccc52733ca3c2b65ec1/36122007151.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/76535490711.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b62a33c9---borosesefimugegulijusurot.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db8da01cf---tekogaxiginikaxexosu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/e62solqb7eume2v5ier0fns9mg/faselake.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/fesux.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b99032b8bc9---20771014881.pdfIn PDF document text
    • http://whatdwellswithin.com/file/62810251742.pdfIn PDF document text
    • 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_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 29152 bytes
SHA-256: 4a7e3d234a4a0b9515d75d204507d1af20a2e3cb21b22e922e25a0f5238c38cd
font_02_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 10536 bytes
SHA-256: 1530736b67b9970e6cc361ee8a763cfae35848bb2f584e9665d1ed1e379b7fb6

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