Malicious PDF — malware analysis report

Static analysis result for SHA-256 3178dc84ce059f8d…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 01:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ddce1588fc1013656854c340c540d24c SHA-1: a0ec688837be47703416e71db13aab2ae5d5e978 SHA-256: 3178dc84ce059f8dda7fb058b2a00717cb4dff36bb458acac6e44fbc31ec09f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to distribute links, likely for phishing or malware delivery. No scripts were extracted, but the overall structure suggests a malicious document intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=the+way+maker PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7b95dc86---46690809020.pdfIn PDF document text
    • http://wych123.com/upload/files/bavijoko.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/47205960887.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890643effe5---21779603188.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/95df6d81a28b38229fb0ada2c53ec397/92891336994.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2249963dd23f084b48f6d9ed91999058/zupetux.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/jivofikiwan.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/74016d3ad827933935bae661c198bfcc/88424175428.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/64062174922.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5095a43c---pipomimebi.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/perogule.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ddaa6209---towobaxunewosobavaro.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/79664647621.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8dc043dfad12f298866417599720ce57/60880015459.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/42365578510.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12813d8c0d---38232233363.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/5805280947.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2205152661a2cf02175f607555318c14/ridefukebapozon.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb5c78c3b---papezasawanaxumivifu.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/wufuzulekogeliwigep.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789772a1e59---94439899025.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/58601427509.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210610182627470444fmjbw.pdfIn PDF document text
    • http://teplospectr.ru/images/files/8871563226.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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 10000 bytes
SHA-256: 53a3ff9bdbdc29fb53d907a3eada8a5828921a3f9ad3a3e21406645256b99a04
font_02_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 17792 bytes
SHA-256: 7eed14216a876ae5346e2becc0c2d268a694163b4f5cc1739dda855c5c27a37e