Malicious PDF — malware analysis report

Static analysis result for SHA-256 799728d438745565…

MALICIOUS

PDF

91.9 KB Created: 2021-08-11 07:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa629c04d527042f3d20d3a2863320b7 SHA-1: b023b809c3e297c2e42695954e432388ec7054a7 SHA-256: 799728d4387455654651bf951e67a4d3584ff434d9f69631064afedb29ff74be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://shbaicun.com/userfiles/file/2021072812180673499.pdf
    • http://capableapp.com/uploads/files/mipewenus.pdf
    • https://callmarkinvestments.com/callmark/files/60995529342.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1a92240cc911eecd475e579335c5c565/47771902620.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8dbb57d11---15660582563.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t1u0qk1dc72m4r1olp85poho1r/zurirotewiduvadeben.pdf
    • http://vhs1970.com/clients/873287/File/17256077279.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/db465af335faf7c24494c8aad575fcab/kodabe.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pb90ioal9hr5rv9rppmj2fgfp9/211793007.pdf
    • https://dietacud.eu/upload/file/6533975947.pdf
    • https://radio-aurea.eu/files/file/22045952933.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160882a1e44782---rerovurubela.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/31614893186.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710fb16762e---32746202067.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/76d9df9a4f27e47127c9add862502776/revew.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/18e38ff9dd488415320e1ab18a851661/dukagifax.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50719c9b2d---gokejosovemoluvib.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf84916928---76164334416.pdf
    • http://signauction.net/userfiles/file/zaretakede.pdf
    • https://bdsvieclam.com/upload/files/87648972160.pdf
    • http://hermandadperdon.es/userfiles/file/87761277550.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+deal+with+a+parent+who+is+narcissistic
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010256.bin
342014a6668b7adc4144fa1c40e6a536af40149aa7c7c3fe44fb9934895901df
pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 17076 bytes
font_01_sfnt_off00012e8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 16792 bytes
font_02_sfnt_off000146a4.bin
cd0412bcc6e24d87e824fb57ed87b0e6c5c8fcff1cd9df6cf3efa01117971e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 10688 bytes