Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b27be39bba88043…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 20:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14af701f0562cbafc253ec43a0a84d6c SHA-1: 29bab0930bd5c180958dcabfd0a7deef8ded032b SHA-256: 5b27be39bba88043d73022912e25a6578b73aad855bb6a6d55790558a0a5580d
181 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. Heuristics suggest it's a piracy lure and a link farm on disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • PDF advertises pirated movie streaming/download medium PDF_PIRACY_STREAMING_LURE
    PDF rendered text advertises free full-movie streaming or download using piracy-brand names or a 'full movie + download/free/watch' intent phrase — recovered after folding the styled Unicode confusables the campaign uses to hide those keywords from plain-text detection. These are disposable SEO-spam carriers that route users to malvertising, fake-player, and scam pages; the PDF itself is inert.
  • 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://kvbm.org/pds/userfiles/files/63403147667.pdf In PDF document text
    • http://hnc2.com/userfiles/file/25056865061.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/dowatu.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/9b78a78a93b7016552ae2f83d7b9a448/ruwerifazinitutejobepezu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/85f05f3b39b54382bec969c6c39b1358/joriwuju.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/jubaxuzonaduteza.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/2639082125.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e35c6a837---27286692628.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160865c80b908b---74294696082.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0298a04e---67717226704.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/dotowosuf.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kifikafasijiridire.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/29afe0cf31f367efce90d141973f4149/rakesulosafoguzowulijini.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/lerariz.pdfIn PDF document text
    • https://stauber.lt/images/files/fuvufebewosolexexenap.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/7348914836.pdfIn PDF document text
    • https://limsurdua.com/contents//files/pavubotulowojegejegu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5439a0f4794d82bedc1e931028ed6ae/fogufodadomilul.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/mveifd6ogmm3obkk3edbmc3sk3/48146679162.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/49750219895.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf58c0b4498---padifupedenur.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/25923578296.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954a55508e4---getibi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2b2c867e895ab8210956fd7b2587df72/70328358057.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/if79lcd611rf3bbfitmsfkpki7/fasefizur.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/vatetikezowuxoduwiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=present+perfect+simple+and+continuous+lesson+plan+pdfPDF 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 extracted file (font_00_sfnt_off0000e3fa.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000e3fa.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 16320 bytes
SHA-256: 172bda705d3096a954e0ec48d4ff5277114b4bf3b6ada9b67a6249f4a4ba407d
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 10884 bytes
SHA-256: f30d805f1db607df17fc4991aa7bde1af3d8e13e83138e9d8b67226bf7a1a8ab