Malicious PDF — malware analysis report

Static analysis result for SHA-256 68654f83cd3f99e8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 15:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8414c02c3f7e8cb0450ef3cbf6d88f30 SHA-1: 2a445b4cc7499d33fd87e28e46cbbaf541a6eb63 SHA-256: 68654f83cd3f99e8c711182af4af42c6175dcab7abc868a9b2e3d3adf50fa898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to domains that are either compromised or appear to be disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=mock+location+pokemon+go+2020 PDF link annotation
    • http://angerdress.store/ckfinder/userfiles/files/xotapipulepawadodemetibo.pdfIn PDF document text
    • https://birotex.rs/images/files/kabivimekisolesadem.pdfIn PDF document text
    • http://cecev.com/stockages/files/36220682474.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/34743192994.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/rofitusuzurarabaf.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/73313674471.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/vivob.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/vajorufebipezisej.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/bufavutebolelemepajeza.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161330415eac86---55970345072.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/eq7os5to7oovj6k3nsf01l8er5/2338527806.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109160258065202.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/73695684037.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/78403489101.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/kagazatexu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/47096453775.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/84807207173.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83qquiu5fh945v5ultvb0kdfi7/luseki.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a34aea2d8---99597796181.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sutevofamatirilewesefav.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/54347721167.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/89546629075.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/77133630679.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/74712538312.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_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 19484 bytes
SHA-256: 82310da2691b0f2eeead5330a2c33bb0df96ec3842502bc3e661576cc7771ba7
font_02_sfnt_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 10776 bytes
SHA-256: 88feceeadaf624bf8d19b6cadd54d3b3e2731bbc6639f197660ee4f10fa12c9e

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