Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bb4e5776961cd1…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 20:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c2dbe795ca04e8c39f483274b2e22fe SHA-1: 3b599f9a6ce2f01aeab9af41f010ccfe0f64d132 SHA-256: 07bb4e5776961cd10a1eba14a76ec846facbaa06c0bd39362649cd2b6aeb05d3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host phishing content or further malware. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1da914a350bf11a44822fdaafbca3d3b/75587307867.pdf In PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/53174293436.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nitijed.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983ed183dc---kebubasowor.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6f9d1881---pilun.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/44831105471.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/44865825146.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/87657580387.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ed9d1bd41c4afd218ea6d3b64fa9d2ec/gewetudikejigubojuveza.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/174411438.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/zogepadomivaleman.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/fd1bbe7662982e03a9f21d035bb12a74/5735811915.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/34527168227.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/bemozazedokem.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a100a28a6f6---58166282259.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c5979342---fidoteruledonagosubale.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/32823806b577c6a25a1d5308f121bb34/vagurorixugek.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf4a8c798---xofopefudewetozadul.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_6EB86EC353DCFA01.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/noloruze.pdfIn PDF document text
    • http://vitrine-prof.com/files/48138589249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=eritema+nodoso+tratamento+pdfPDF 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10596 bytes
SHA-256: 0025f1a443d1886faa566a218ce1767e8cae9facf8c91120dbfb68ae29afad17
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 18216 bytes
SHA-256: a0254b4140cdbf4012118939607b6887fdcdcee21e538deb0248de7dd3964d49
font_02_sfnt_off000139f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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