Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd84f65b7d1a14a…

MALICIOUS

PDF

100.8 KB Created: 2021-09-18 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 433e9e8cf8df287832dd7bf73d5d3a40 SHA-1: 4baf28e70d30e1dec0004503fd202fd6f4113505 SHA-256: 5fd84f65b7d1a14a060521098f483362ebbacad9740b17db112a064a9e0343fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://banner-ever.com/ckImg/files/jesanetirunubolabozil.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/peromujuwunulakijogowilak.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/54131527102.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/snkt564uajj3rpfi37ek8s7mc5/50808410111.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/wanujumeregalenazis.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/80766121389.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/jezavak.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/98984247655.pdfIn PDF document text
    • https://samudra99.com/contents/files/lebubokujajabidedabutu.pdfIn PDF document text
    • http://etnorom.hu/pictures/joxepojoninizuzuriw.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210916044647.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/fakopenosevuzojixiwiwu.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/zumuvusufimireteru.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/dadetafodedimud.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/76181639982.pdfIn PDF document text
    • http://cutskytools.com/d/files/rusokidatasonolebopu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/17376120591.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/giragajajanez.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e6d070dd1e79c01ffd96593a63e7b4eb/9607136336.pdfIn PDF document text
    • http://arsvet.ru/img/upload/minamopojoxuwokuxapivom.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/wuzuzumubeju.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed01436d6b---56412393930.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/libomifug.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jisakivuvoliz.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/26573308560.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/7900559428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=moto+one+fusion+plus+android+updatePDF 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_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 18684 bytes
SHA-256: d1333c7ccf3b678f2c82b53486216a389e5d196bb17e7d57d83f0e74dbd5dc64
font_01_sfnt_off00015438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15438 10584 bytes
SHA-256: 7431abfd13e6387325e66a58f819236699fe2be76dc0270a99653b547d7f5eee
font_02_sfnt_off00016c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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