Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed970f7a8a85397a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 21:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6dc0f9ada8885d52a7f79efd62b91dc SHA-1: 26c1d56269d788cd9fe4f51040a7a37a6de3eeec SHA-256: ed970f7a8a85397a27c61d7d153b05ff5b40280dd2875e05a6ca1b6161d48b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=how+to+speed+up+the+internet+on+my+phone PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/08c09ee6f21d674fadca681f30f49978/99891577889.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/vuwiralasenazebubemul.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/54495498514.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/sirijulini.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/bevevemibemawipakuzatunab.pdfIn PDF document text
    • http://cutskytools.com/d/files/46716014050.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/89453578840.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/benojapuxomoxoxuxakor.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/51497386306.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/11982630244.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/31539281147.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/96086037495.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ttmabfhiki6g2e1v5tu18alh/87092057714.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/4490877467.pdfIn PDF document text
    • https://majubesar.net/contents/files/zunumibasagejer.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wibigizebus.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/36432862430.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/warigar.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/bosogoniv.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4b8c7a5c4ffbe28c3b0cce1bd7d14a65/8866481347.pdfIn PDF document text
    • http://apothepharma.com/upload/files/jipemoxuxedu.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109170000552383.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_off0000b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 10740 bytes
SHA-256: e3221ecc59e1644e529563fbd0f2dfe493d008c0edf72dba0630be97bca14206
font_02_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 17588 bytes
SHA-256: 23048e8d20d8b813fb0e0062c6d2fe7040398e1f74e2422003051748524ca558