Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ab228c9cb00143…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 15:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6571fa1d34deb6449dad5e8a4371b46e SHA-1: d3569018ed36ae830194b5b3e759f45745a04e45 SHA-256: 54ab228c9cb0014379c2d738bfab660c3c85c69a9a62d3506084d261b21e51eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cioccolatogallucci.it/userfiles/file/18411337176.pdf In PDF document text
    • https://dansobentre.net/uploads/file/pupemurujekebesugezofuj.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/62160726787.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/20197b10116b1383ddb6ec11967f7b16/gapakebovoluziguj.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/35155655609.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/20506016108.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f46e4df2b42641749ff3be7202ab31e/59317632968.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/42897553524.pdfIn PDF document text
    • https://kermanrooz.com/img/files/27456508740.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b3591c841---13403786336.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/87813218501.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1853284d0---jukexilolutuna.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/diniwavuguvi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1cd7b36f7a6c07f38309c62c2a784f54/47705125685.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/sewepasijonozuge.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/dewavefubizitopidom.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386df1b79d---38394794727.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/18104167034.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8e32f1b4d404c3f13b794b1f46ceb02e/21723758967.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/65197501616.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b2ee8df---5239442932.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/dokafib.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/omhhbh4oc0d02l6bttogva56hj/xamokemolutupotagujifow.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7v073rltk47mln1tci0mp4sfe1/gimemutukuduxesimiruzunun.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/subazejelowunekebow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=colorimetric+method+principle+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 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 10588 bytes
SHA-256: 4c519884e15af11e8bd7a75738007967c68e29352c45d8deda1064879cc8d683
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 18484 bytes
SHA-256: c2db5cdd8cdca0ba85fd338b88c82fd7dbfea47ebdd8f8e9680425cbb4630724
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1