Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3780f6eea6434c…

MALICIOUS

PDF

96.8 KB Created: 2021-08-08 08:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: aa6c19183d6c6d3f226564a4d65753bc SHA-1: a41ee8b2ace3beb305ce06d3871fc01a90825bef SHA-256: 9c3780f6eea6434c6b1e16e62c1b77931a3558a6ec7cc949bb8034eba2ab6282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 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://ajwatravel.com/wheelmarine/userfiles/file/nojose.pdf In PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/43274330625.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/45193837425.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5ae3679fc8647e362509b3fe36eadbd3/mepiw.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/41ae2e18eac8fbe7996f602f2b949afe/93307291993.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac790ed4449---gajowobivikapozolos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b5564ef4---niratunenisozisezovotobi.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/77917000999.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/78320921706.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/55487197130.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092beabb5c27---79095916253.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/98206067868.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/97627793173.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f244eh9ssd4sgigi8tbakjqgft/birazagutaba.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d3e759fde62198590b762dc8b70f7df2/mifoxetenur.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/26331501404.pdfIn PDF document text
    • http://tipiland.net/upload/file/94684654352.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/73803815865.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93ebc8df5---sikumiparotanuje.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752c9c1354d---woxapomat.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3c503e41---zepetebevoniwenoju.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20217292346458048.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/duladoxonaxalejuku.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3557023226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=filmora+pro+apk+without+watermarkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 17908 bytes
SHA-256: 83c680a0564683c8267ae71f273cc982fdd076be130d604ceff8c869a5c78c11
font_01_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 10500 bytes
SHA-256: a45bf548db6e51840330c5d7aa052ae3dcd5d0d16addf89ba43ca0cec5b07432
font_02_sfnt_off00014712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F23 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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