Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa827ae2fa8b6c43…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 14:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4969288e985798bfa2e4f89f6b74bd15 SHA-1: 5b3ce1007313cc401090eb08148bcc82cbcf8f1c SHA-256: aa827ae2fa8b6c432665477bd81ecf55afa128b157cb0433fa20de0caf872f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://envida-nieuws.nl/bsb_website/upload_fck/file/zasoruxevowuta.pdf In PDF document text
    • http://lyzjkgm.com/d/files/tupazowipuga.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lojilunuxusujeburejuvuj.pdfIn PDF document text
    • https://synersys.fr/contenu/file/fosewatukuzela.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/19766205674.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/berejavid.pdfIn PDF document text
    • https://tsegypt.com/file/gopagukabusikafixo.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/23885253873.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/42926343119.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gajixa.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/14472126816.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267373e39b---wapoje.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/48313457125.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/27134566681.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/34550946348.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/120e3d7c32d166b52ab9c9dea0951627/romodamijasad.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360d3418155---janopa.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/31622220804.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/daruzagewakubumetimixi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6eb4a8d1c2acc960b3d9c14bf3a85cf3/4204014686.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210901110755568.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312e1334390---nebagikaw.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/lexorenorowulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=edvard+munch+the+scream+painting+meaningPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 19100 bytes
SHA-256: f3cbd8e3ec5160591b8b3411e6350711e79f6c4a900ece8ad5e86ee4e1bf56d0
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 10944 bytes
SHA-256: 3544594a2a09fa41a4d2258b1f325beeb0a5480b626e1d499d5680499f6e787d

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