Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd27838576c8d181…

MALICIOUS

PDF

90.8 KB Created: 2021-07-16 14:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dfd530ead220918227fe8e923b51c0d2 SHA-1: 0600255c2ff2f068534f71185cd4768731ff05d3 SHA-256: dd27838576c8d181103bb0af3b84864f90c2ad03a2e7892db78dc8cb405d4a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of PDF link farm heuristics and compromised upload links points to an attack pattern focused on redirecting users to potentially harmful sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d67eba7d683---59138921516.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ufh5an3echreaikm9bj23pi334/34041934132.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c96bb2b0212---toweralamelapenaso.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/81563242262.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160784a916024d---wuwepimoxujez.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b6a1723ba79da50e32b4fc7899b443f0/fudezetusevinupofubat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42fc1cd3c5---xufege.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/13h5v1p00kbimk08h6kgqtdka3/vasazebiwite.pdfIn PDF document text
    • https://stopserv.ru/files/file/88335899130.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/504f95dbcf8fda8daa9ed18e1cb22c45/fozipibize.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db573200539---59101682029.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ziwavatodumotedaguv.pdfIn PDF document text
    • https://ubranni.com/uploader/files/veritowulegulukunogevupud.pdfIn PDF document text
    • http://mega.kz/media/upload/files/88572652058.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/859bf2d76d968d8d52dda9f841dab49e/rolewutuledapiwi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099467c980a9---vemawuguxowowuv.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe80d26055---xapegepefo.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/dujawizuxaserakav.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/41993452087.pdfIn PDF document text
    • http://unseretochter.com/images/file/rotudirutujodegoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=doctor+job+interview+questions+and+answersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kidezufetozevova.pdfIn PDF document text
    • 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_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 16912 bytes
SHA-256: bee92679331758c50ea8b42be6b28ea0f9cdda50b77623b67b4a0252310cadae
font_02_sfnt_off00014479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 10984 bytes
SHA-256: aba0b39b2d1c4e59e241b440a6279ea003e898625ee55d2aa783b43e0a3018cc

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