Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddb563201851d0d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 08:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f02e4fb0768419d7d17f11b5b8a064cc SHA-1: a5579feaf43887800c718a95c3e61bb731dae1d2 SHA-256: 7ddb563201851d0da54ff32116c6921e27ff9e5ea0cfdf9126cbfab64cb28aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised or disposable. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://egokituz.org/files/galeria/files/waluza.pdf In PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/96508261908.pdfIn PDF document text
    • http://axwelindia.com/uploads/mefage.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1084b5280aa058f430c6a1c001b55732/72565483878.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/temurajunagibajizuvidaf.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bks0kq57p3h9j8g81tn1doac21/65826209430.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/15889496864.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6afd283a49---jakejolibufinetotafutud.pdfIn PDF document text
    • http://abpaluso.com/upload/file/55057659063.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/78992474192.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fuxodikitezisode.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3pemvclmlil957vh7cra7imqv7/58463699827.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/60f5181c5020ed99980bb7d77cae8a90/vaziwuxisakevopu.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/sutabiraximidopodixabil.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1285a5e1e---48045055983.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-15/20210515114214378120.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/2861397777.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/sewusunorebuzalofumasaj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e97102b995a---nonekiligir.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff3fa97f9---pepameloxegula.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/10445662814.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/54928357482.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/43155674754.pdfIn PDF document text
    • https://blogsma.com/files/ruzajurokexova.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v9sfpp6dstnqi8lfulv9ns3p90/95429271733.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/vupizusaxowur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apache+hadoop+3+quick+start+guide+pdf+downloadPDF 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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 17176 bytes
SHA-256: ac5cb90b121fdd6a850fd1e4d12df412f3ebdb77db95241da464f7022465ba48
font_02_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 11476 bytes
SHA-256: 48a70b1393c0b78741af16cdb9bbaddddf3b6d971227cf23d4948b5f53ac56ee

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