Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ff8aa803c23f9e…

MALICIOUS

PDF

76.7 KB Created: 2021-06-28 19:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f3b83ff9391d7c7997e60f190b8fa130 SHA-1: 32f82bd62031f7771456aef191ca23feaa82ce73 SHA-256: c3ff8aa803c23f9eda69754c018e7e5017390cd7fe9bc8e57e99ddcd0aecd119
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, presenting numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. This pattern suggests the PDF is used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=vector+1+million+rechargeable+spotlight+manual PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/57010503771.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd89d4f15---timafevesebipe.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/29303371068.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948752a6beb---76416182434.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/rakejexizinis.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/83883636396.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d34082ba803---37976241894.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e8c49fa1---liganefepadarovulaz.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/zidaxuleseruderabig.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/golegebifopiz.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ae8a5aef94ef263fc158e7ad26182109/ragita.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/xoxefozetumujuluboter.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/adfo6or1bitc9ur30tl9ep9j9k/jalatixavupozexir.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f4a6dcc488bad0596712d5f51e64a4e0/fonumiroxobafiteralewov.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mf3q10erum4iocvp8ut9nq23fl/23130815791.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/90254211479.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/cba3iag75chn0edm848rkos70a/233341847.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cc6e08b8688971d4bf6a65c7d0b2cb42/tubesifuda.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c283801878efc4af511abc0f00db4b60/damobator.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0be37936b---xogagawotewe.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/aad6c3b50d82bae91ccb46b13f6831f4/vedulugugajivop.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gutenevigigabinenisotudo.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_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 11084 bytes
SHA-256: 880b41828286c71f311e34946157e861f434beded15d0d5fb5d422229926385e
font_02_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 16796 bytes
SHA-256: fd5f506c73e36e824f05b28f69b665f58ce826c5550d8eace97a16ce79a5a15a

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