Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76cc9797867adeb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 22:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dfb7179aafa1236bc167c9cc2aca903 SHA-1: 2e105cef979208c66372bd9b036feb033e260c71 SHA-256: d76cc9797867adebe83773bab3652ea3693582489c40d442b29f8d4756419d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns align with common PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://rfinshaat.az/userfiles/file/xiwuxiruzanudiwilogeka.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7anlo73kc02biq2suvp8v9lnr8/kebugawiwa.pdfIn PDF document text
    • http://wawa757.com/uploads/files/57268563178.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/lusakolodamurisoke.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/73671499618.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/nezovabegiwomovoxevukuruk.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/wobakivuzapisularilufo.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091312255423.pdfIn PDF document text
    • http://pi-consulting.ch/download/18804369765.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/tukozilizesipozewa.pdfIn PDF document text
    • http://rayanchem.com/d/files/67594905212.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/1983453421.pdfIn PDF document text
    • http://atya.eu/files/file/57813037502.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/loxexozenobunipigakuka.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/goduvazenuwotopixemudax.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kodururavatum.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a79dbd3fc---22819251607.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jukuxib.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612efabac3092---nefelenitenepe.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/paxapirujuj.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/tewesesonujalodezipumoket.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/34350118793.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ab9bbd625fad507aa60e13d114fc3dfd/budamowobulutudav.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/980344759.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pezalufigan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=autumn+lights+2016+watch+onlinePDF 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_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 18060 bytes
SHA-256: d12ba8ab72bbec2a4b756287fdd3cb11aef9b43e35f30a384b46e4db469562d1
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11204 bytes
SHA-256: d961b646793a2c134edbd876b223e1c51d01db771d57166199449fdf6cf62224
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1