Malicious PDF — malware analysis report

Static analysis result for SHA-256 c991acc78ef786b9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 04:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d64c3f1b804c7e9d2c8e7e9056058c3 SHA-1: a4bd750c19643e725c176a8ce9fb9008c03fa452 SHA-256: c991acc78ef786b9001bc37186d376045cdcd0074799f0f57da5c94c54bc4924
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting sites, likely intended to host phishing content or further malware. The PDF structure and embedded URLs suggest a tactic to trick users into visiting malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bjjewels.net/nbloom/fckuploads/file/78485637587.pdf In PDF document text
    • http://mexxeopaint.com/upload/files/98743202226.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jepot.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nodixafikuxemodajizin.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/43231783361.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/tijatikizujopim.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nuzodagakafutave.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/jipaxi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8e7ae5eefc57a59f3dec906f9cdf5edd/niwajikalererulusija.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/73288019709.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/judasage.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/savezizove.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/fiselujimobunazojegebijed.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/jefutifasad.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e45de3c0aceca42d810c25ced7af30ea/34631595760.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zokogifobekoj.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/31230710328.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/xowufuxusuj.pdfIn PDF document text
    • http://a-pluset.com/userfiles/73546164242.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613decbe34eec---38188883298.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/19777152644.pdfIn PDF document text
    • http://amandamaitland.com/images/file/vepubiresuferag.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/gesuredewupapaxapaparok.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/nolomiziremazenikafiwope.pdfIn PDF document text
    • https://ysh.my/userfiles/file/xeravu.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/dajigaxisufabar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=preposition+of+position+worksheetPDF 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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 18436 bytes
SHA-256: caa607ad02a326b6287259814b6c2838afc416ff6592cf6feae83da40052764f
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10424 bytes
SHA-256: bd7bfeaeb7980dc7b9eff9c5938433dc175ee563953d775c6172305025e3cda7
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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