Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ec7d71e929f354…

MALICIOUS

PDF

92.1 KB Created: 2021-09-15 06:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcb934ec00ca25591dd3a563615d563d SHA-1: 4d382fe2f90e109ce3a1ef7605eb184f1d638f48 SHA-256: 15ec7d71e929f354ff8c691212a224f650a4c2f6cabe5e78a8900c13ce4ce8ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://raffaelecavazzoni.com/userfiles/files/luwizo.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139700f529ca---mujukil.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jotogex.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/tekonulo.pdfIn PDF document text
    • http://rotang.net/userfiles/file/6659912777.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141121f5825d---bodopuvuvibonujirerugude.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/nqs4s2fqk2bjsl0tlh2btvg0r4/xelukarekaxatopukuker.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/suwovazobozezevikino.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8921db5eda3b4a1d96af3515772272c4/nezokabeboluzakuzizoli.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/om5edqj3fnrcqv17elmfmoj42g/jolivugijumiwujifedazofo.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lexomukoxavegef.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/wuvosibe.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32147813571.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5b3082a1---nituwaxubeputubovufi.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/73116767230.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/41285870929.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/skhpm3k4hbr3jh69dvpd6l7ke9/45288509430.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/68544761520.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/75541025739.pdfIn PDF document text
    • http://newworldss.com/uploads/file/7022760668.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/pesofejuvapugilezoza.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/6313462347.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/11643896824.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/bobosidalokuzazalaxosetig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=world+best+fitness+appPDF 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_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 17740 bytes
SHA-256: d705ae62e0b843911dc5ce1c6a69208570b47acf5de8601d772c66cb4ccc6a7e
font_02_sfnt_off00014acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACF 10624 bytes
SHA-256: b32792c4b03519c432873241c7c20e6e98352823f52c48c408c6d74c67073f14