Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b4e40dae7e3b4f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 12:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c1a965c8badfbad3121cd9c3cd88c30 SHA-1: c3a4f4304ef1dd0d006bfcf9f02203c2bbfb8321 SHA-256: 82b4e40dae7e3b4f1a9adcc59cfd15d218b714bbe3c08c3dd3c6f1f4ee542f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=123movies+the+100+season+7 PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec045da---38929447036.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210917_181056.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/65053078077.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/18011321966.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/34593312443.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/29087238013.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630998978.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df76bd4b80---gexadasokegalum.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/julidupixupiwa.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/86213701708.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nokonigona.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/33562202018.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/pevuzimeware.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147e91f9b02a---31381530237.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/adefavojo.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vidurugejodedizam.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e37867249---36063057621.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/1655374261.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/sexosajamod.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/nuzizonavisotafatuk.pdfIn PDF document text
    • http://heizler.hu/files/file/xivakige.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4a136143e6618f2361d21a9f2e67d28e/mevewarixulu.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/80923533455.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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 18844 bytes
SHA-256: 9d86ab8c6213a04df0e6af0121a17fcce6934c1740e8a95605078791ec6ead25
font_01_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 10712 bytes
SHA-256: 3669b8428b9578c1c57881123baf2bf0207103c9509a329077184e791e910dfe