Malicious PDF — malware analysis report

Static analysis result for SHA-256 638e03b1c1ebeb65…

MALICIOUS

PDF

82.0 KB Created: 2021-06-15 17:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3aa4a8217bc45fde36a235738b46f41e SHA-1: 3357aa55e530336bd9024a129ea526f4aae039c0 SHA-256: 638e03b1c1ebeb655567d49f96bf569d8a3a6db540f66f0a95e181112a59083b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=fate+of+furious+full+movie+download PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ab5d6350---xomuzobolawawijexeb.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e22f9b67667e8296a03f0544dffa47b5/5163059415.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/6jdibv50cvh5qfb2j1gua7k0q5/33352725161.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cquc7evvnaot186ef0j6sas271/43849388795.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/39262997691.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607994abbc9bf---vigegusedobezojobelanim.pdfIn PDF document text
    • http://synowka.pl/galeria/file/luwubaz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/gtam330qkt33hbs7ulvpkfphsm/zivazosa.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/25257865653.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/15733910289.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/78679376947.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513224258957186.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d8ps6nnjfsq4vfd7cs5mv149cf/62440351146.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/zigixepemoz.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4uhtpq58brg59qcql1c4gqikiu/rebiwefuzeli.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609021e0e9466---wusenujekopad.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608556dc78885---53889160703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5160 bytes
SHA-256: 49ee5defff81b1415d0abb763204fb399f207dccf15a17a13922d3d0d8ebcc57
font_01_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 11420 bytes
SHA-256: 6b1cd5b16a1633030241a38468712e34d4d65af02f8bfd36a3aa5d8a26270239