Malicious PDF — malware analysis report

Static analysis result for SHA-256 518138abd524b7ac…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 16:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 216c45f01d2dfd27014c049a0ac9364c SHA-1: 1747dba0f755d515691a229b02dd67c6c1820915 SHA-256: 518138abd524b7acc43d0aa3a2f19201ce582700602fae1eaf770e3815baaaf9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, a common tactic for distributing malware. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into downloading further malicious content, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2m4bf45oef3ifgrtmic8kf9k9k/49687200728.pdf In PDF document text
    • https://spandoekland.nl/userfiles/file/62622217994.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d7f7f6c8---jejegetitadobowiramimerad.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/bozodewulakusepimese.pdfIn PDF document text
    • https://mmszke.hu/files/file/nofupilum.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/78426920827.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/vojujifumiwupabesikubex.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xatuxixibiwijafagoxoti.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/palutobixixafesedajonevo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134502007bd3---wofaxiludabuxixusoruwo.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/gikuruk.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/18942278917.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/tomegez.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/9693298927.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/tapowenojiligifuzuz.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xalabazavixusovosen.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161365c20dcf30---68425001083.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/45725056644.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019b3382c4---2685046150.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/95654013489.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/na77j34agk1fd2gdkghra9eqp1/gowuladat.pdfIn PDF document text
    • http://tochuchoinghi.org/files/vitewedopefotafisemomivu.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/51628320084.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/84842298250.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kakuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=internet+calling+whatsapp+androidPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10832 bytes
SHA-256: 5d3fc2469cba2d5c2fa4b43728396de75de146a7401b2e3bfc4c46dd8b8928dc
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 17512 bytes
SHA-256: d022fe558b118ffb28bb327d90ca8be2dae70220ce8ddf6c3f95d44526219acc
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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