Malicious PDF — malware analysis report

Static analysis result for SHA-256 5372248bf033cc3c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 06:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38238e9d25f4645524b6e9c4112e97cc SHA-1: 390e8a03eea243ecc2a92b914a511f1fb9bb526e SHA-256: 5372248bf033cc3c83ef4a95134de5323718b6440ed26be16783a207d28400fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://astro2sphere.com/admin/images/file/10129961372.pdf In PDF document text
    • http://www.propper-droppers.nl/files/file/98543582747.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/tuvovesoze.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6873b328652b2f58d6f59bf53ef64e6d/79550935359.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210703064150.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/mezenubaguviwolitemenak.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/39157545040.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/60340895666.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/69150388029.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/36063810347.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/5800665288.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818bbb2dc9b---29863534277.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zororoma.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5054bc5c1b2017c14c5e224009f65e93/58570120168.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af88774fe1c---pefap.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdcc68a0b6---jitamagetumolu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/91854462823.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/sovogojowiv.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bs6b8ulonttr0nihsli9ko0ohg/99329709249.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7be406e7---14612557240.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/15605574745.pdfIn PDF document text
    • http://centromp.it/userfiles/files/54249916908.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/30841401237.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/49154031280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fujitsu+lifebook+5+series+manualPDF 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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 10948 bytes
SHA-256: 790e15b3586595f62649725b098f347fd026d2ff8de3256a15070c655ffad4a8
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 15720 bytes
SHA-256: 4639d6ebd555b1c04c83b0046c4a8719a5c8e3d05346db4d25863da35a9a0663
font_02_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1