Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0b2e8d7360bcba…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 03:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08ff11fbc5d04bbc5dfb6e8c0bce951a SHA-1: 49a2376bd8d86b65402127e705c275650fe3a936 SHA-256: 6b0b2e8d7360bcbacc4beb10c31e1dafd3263516a5a7bc38c882a773ca1684e5
196 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xeroxexpres.cz/userfiles/file/segafubixeteriredakejaf.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf60b7f966---96183124911.pdfIn PDF document text
    • https://artbynela.com/uploads/file/23255563319.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/vovonefovujepigubazaxivo.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/fuzezimagubifubolupon.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jizamafurir.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///631996884.pdfIn PDF document text
    • https://baglab.pl/galeria/file/5301569265.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/wumegigisirodigoxekoduw.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/91208451812.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/21877177673.pdfIn PDF document text
    • http://clerus.hu/files/file/kozekosikajijadidizaju.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/7953477594.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161457425373f6---66255283589.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/88438156782.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/wugenidar.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_22_59_58_2021.pdfIn macro / runtime command snippet
    • http://robbes.nl/media/files/konuzuponaxiwironemudak.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/pigutozojipakalagag.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/91687794902.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ij3m38eijmtsm6vej35tiv8b70/58934190149.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136feb68e96e---tifusilipe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kunosebufatadulexop.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/4907681686.pdfIn PDF document text
    • http://xn--hy1bt45apoapIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=zombie+apps+for+androidPDF 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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10616 bytes
SHA-256: 688b3425b4d05904648c600e70b9efd9277c2a481bf13cd1e2343f9cad736e99
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 18056 bytes
SHA-256: 54c16b3872f32ba9a6b614931e4f2d0111f94d76e3212c6381f138c9682354fd
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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