Malicious PDF — malware analysis report

Static analysis result for SHA-256 8048526ce90e6633…

MALICIOUS

PDF

78.5 KB Created: 2021-09-29 00:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa98468a437d5e9e2cf2c400ae474859 SHA-1: 4b7e348a742d267d08fc497a8bf451c5c8adb6a4 SHA-256: 8048526ce90e6633bd45e6d5a3208e8f2abd77a0dbe205e015ba8675b1b6747d
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs suggest a malicious intent, possibly for SEO manipulation or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious content, aligning with a phishing or trojan distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://qdjshg.com/files/file/63652592884.pdf In PDF document text
    • http://kemnhapkhau.com/upload/files/10163577417.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_843433E7A9A1D436.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/jikas.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219271027189140.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjl522p9l9bjge3m6qma74ukah/24551057829.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/gakuveturazugazudexele.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334bf50ada---xowixe.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/rabupoje.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/mudibaxowunuwasepe.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/mukomikivedagegaguvemot.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210928_D985B7295231F808.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7ace7a826bceb120368baaf48048fb09/14829069762.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/vamobok.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gigakewoxakuletuma.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/69198578861.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1cb61f7388a906b6841d4a89c2047372/nemabibeluw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6eba44d0a---tezevin.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/65067599352.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/watovinulupeg.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/fowatizadizedefoxivuwo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/16942310349.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/79107533164.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/80042487552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=doujinshi+android+18PDF 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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 10560 bytes
SHA-256: f34ac444cef97f640d8a556ee56a122b357733467dd7c447c9e018e59632f247
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 21152 bytes
SHA-256: bba4b9577cc74c4ed8c8fec9fd3dc1c9cf46ccce28f373ab8a0577082ed10e7e

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