Malicious PDF — malware analysis report

Static analysis result for SHA-256 576c362df516acae…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 03:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77cc4f69b52219d2aa7e952fb3c8fd9e SHA-1: 7ebe17dc253bb7647955ae6526cdae06de1b201f SHA-256: 576c362df516acaed37591bcd903e8e380843319245a480706ccca355358cecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=tetris+apk+offline PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4534619a1---42613116154.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ce562bf2e67c8f708de3a1e935448c22/11934786595.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/52651800343.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/daluxovogurebu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/29945787896.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xokugo.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/jizonu.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/natofepedizorezotimuw.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/49979308799.pdfIn PDF document text
    • http://strahyi.ru/images/file/73064097688.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/nukumeburupotesexop.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/luwanatamepasujomumelif.pdfIn PDF document text
    • http://lukinserv.hu/file/nagonozu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa7d8610e---pigulapigosezobuf.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a06961e4---pipibixukokofasoxilad.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/duleta.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/vagopokofuzagudoxal.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/23096326030.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/difakotep.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3034547709.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/24813096735.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b1f38b751d2ed6aa131cc6a0a4bd6092/xomeruwedinazidisexewo.pdfIn PDF document text
    • http://195exim.com/datas/files/vavudixifasilixurawomodu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/fenanajogulovodoxemal.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_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 23888 bytes
SHA-256: b3e5978c392493cf4ad5bc5ce73a4abe03bd7589344c0f5431092594aa8bcb5c
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 10404 bytes
SHA-256: 4e8992a56977dac71c1d9de5f0033a33c92dff5c4e56d3b7d068d3aede3bebe4

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