Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b36ed643c5ff0b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 17:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab5ac93d1dc220bc85c0a9cd4e7a8c1b SHA-1: 064e996cab2db71ee53767c4d4e46ed0e7f5a053 SHA-256: 04b36ed643c5ff0b08f67a3fb0e25ba3cda631f182015437ecb4487803bd0385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to phishing or malware distribution sites. The PDF structure and the presence of multiple external URIs suggest an attempt to leverage SEO or distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=superficies+cuadricas+pdf PDF link annotation
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/24269674630.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xuxalekozaxizojuna.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4771381558eab8fb671a680c8704769b/meforag.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/50688906955.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/sanizavepezezomezuxuto.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/decaeeea6eb21d281757ebf1d712c65a/4861280033.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • http://keacg.com/upload/files/71092199153.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0417527fdf52705d12812b023f059bed/xidegex.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210825_2545C3F98CB8830C.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kowovugixotixovola.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/g77gnac9tusi13q58a70pn5ot2/liwuwabapirazawopabilo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/90198163443.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609560dbeae18---buvofibagugogaguneluweza.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/bufujelud.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rimemejelagivekaxusedilu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tijoka.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/376ed29c679f6bc0ca5121eef882df0d/76515192034.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236f6125e71---2069071227.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/58585870453.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a05ed7fa52ef36559eab58fd842e4162/60211187903.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nirolinozelamobowimi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d415b0bb3bbc9dda09dfad6bd9f135ce/50724562275.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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 17544 bytes
SHA-256: 871e70ca1eee3d8c0909eaf8a7e9ce9ec2f9265e975d46ca83d3117347e1d814
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 10420 bytes
SHA-256: a5b2a8a8a61bfd3f31f13656694231d3285704784e9bcf334d7fa646f37b1af2

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