Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac45eddb37b7bfd2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 10:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c20c1c20e6fa6d382394d22a5ef091b SHA-1: bc5a863e6082087ecca9c0ce14d1506408ff6537 SHA-256: ac45eddb37b7bfd27772b705bd5e84991b463fb0370f1d6a5304aaddde0f17a2
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is designed to funnel users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://synerhu.ru/uplcv?utm_term=area+and+perimeter+missing+sides+worksheet PDF link annotation
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/giwanajijolisiwabuxiw.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/37664709213.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/1233812289.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/66486224108.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/i56hqe8mdaj7vh7rel6ajg0936/47873979629.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/burejesopo.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/96126703502.pdfIn PDF document text
    • http://nemochem.cn/upload/files/mimujoxelep.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d3517e0eb6c9e4d7622a5f52275cedc4/nuwebefubiwoz.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4f3b3a4371e05889f715c138316c1e5/51708507603.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cc2d47fed83b9dfb75a4605b742f442c/devigipadesa.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/24255978695.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/28115194656.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/78857290073.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4d71e5f92586143e1b2e235b5efb3b5d/79806903823.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210908103234_mbywuj.pdfIn PDF document text
    • http://konberdbio.com/upload/files/sexupakazazukefok.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rubaw.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/45658829666.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/gezojin.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/32965576194.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/97515271213.pdfIn PDF document text
    • https://arerp.kr/data/file///39849718904.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137e874eb8de---wuvovadiwibuxogevomon.pdfIn PDF document text
    • https://petikdaun.com/contents/files/wemaxurexufizonemanikibe.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/fawexi.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 10952 bytes
SHA-256: 1ea2d9361288ed26ff2e61ef442a8c9001de102627e726879c7b105967105b8e
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 15848 bytes
SHA-256: f535c293084d490eab60356f17bda33fdf7d83d849813a3329eb6fbae396899d

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