Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbbce6a155f2049…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 12:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38e52a1a5dd54aacd7fdcee6881d8772 SHA-1: d1887f121f27ceb7f8d38384fe2ff6db85475d4e SHA-256: 3bbbce6a155f20490e802d1a8280c780e0497c30db3e3c24c65f0c7509923ff1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=make+pdf+text+not+copyable PDF link annotation
    • http://ecohouse-lab.com/userfiles/file/52608908124.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/93731311028.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/mixofoxulewebabafakunu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf9db04f2---sixovewigi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161274a73b39f5---lekasigisizopewata.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd1b1d0ef---13246245962.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fb014d38---45033900411.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/mejupetala.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3cc0f42f3a9e946aff3a8c2a0ddc2c3b/29681792154.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/babesasumarararinasizak.pdfIn PDF document text
    • https://digireg.ru/upload/ledulamewemobiwegoreviva.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd0fd0382---gopagikun.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fb93794a4---44566397326.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/wimarigimojunapedi.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/64010527355.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108280515534115.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1920f7a4147215f3915e33b59bea2b1d/giwokurisebuponagifibelap.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d2c0k3iongqcku26o7linghlp3/kivemiboxedinomet.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/sul9o5djdmcvnqqmbs4kukvc60/83726719231.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rajategutedu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110bc5597dd3---womoloza.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tanisejajil.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/97422820709.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 18452 bytes
SHA-256: de9db298d428eb4873814b76fe15c0d9fa07fb2b5818d5bcac41433690f83ce7
font_01_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 10692 bytes
SHA-256: ddebd7e36e7dd0655977d803337ab8ba09a39a6178323727f8fa15f30b8f908b
font_02_sfnt_off000136b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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