Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec36594243605c3…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fea2ab1772a0b28e0858645c2b9b9869 SHA-1: 12ebda30fb002da11eeebbd1fff9010b1aecea4b SHA-256: 5ec36594243605c336330371f64186ad4eea57d24985b37c0db23910859853c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927a7855d8---53634821614.pdf In PDF document text
    • http://corkpotters.com/images/99558205491.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/97165180126.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/nezovosovegazexokujogowud.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/90159405747.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/48752544552.pdfIn PDF document text
    • https://krusomying.com/data/file/riporidimadibuge.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/18967835264.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee62407573---38987640237.pdfIn PDF document text
    • http://grandfiltr.com/files/file/11775648630.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/16112332349.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132045edc53a---97548975449.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/liteposapup.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/32065422806.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5e34d96759a1ccb6ab57f24d0808bcd6/30779986767.pdfIn PDF document text
    • http://voijin.com/userfiles/files/wivatevar.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219245509753.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/vivumowabeziler.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/53215728255.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9h65ll341tv3s32njl29p1ul27/22276263396.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/061413058799.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zuwid.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///poguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+vpn+on+my+cell+phonePDF 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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 10712 bytes
SHA-256: 0000d6e8d73e0fde0e8b96a4ecd15459677ef90197db1dabb79615be345752d1
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 18336 bytes
SHA-256: 656f6d97cbed6e2fb33eba68a513f7947a970ff403bd0e76fb2da2fdd953c820