Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa753fa158d1c499…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 06:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57a4659394cf70f9d2f0b579421e07cf SHA-1: f53f849bed292ea672b43b8488b7ff5e77a7b3c7 SHA-256: aa753fa158d1c49930ef00b75a5403a22141af9b99219323f74342cb8e3a8626
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic firings suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=download+apk+open+slot+pragmatic+play PDF link annotation
    • http://ikcem.org/userfiles/file///90492476783.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/76632364756.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/64876722438.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135214f47f87---kopegipefopuxanav.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/radoxavener.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/fatenukidivabemarilotegu.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/luture.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/mepuzujidisovosujo.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/tatikiwoperobajolafe.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/57392097778.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kobumoda.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xaxadawitewepubimis.pdfIn PDF document text
    • https://tekmaker.com/upload/files/jepojudupokinosemimobi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gudogexifoxufelubi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pijajutemugomata.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9ab074b8b0bc041cefb9a95eb8976081/wufazewegavezagimir.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sedunaliwujosinovumowebe.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/popemoduresosuwawope.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/pojega.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/rimafolofu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133965c12007---96356252484.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/42348644527.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/17ec7d0e98cd1aad3e3e692850ca0426/5334652140.pdfIn PDF document text
    • https://manenshop.com/upload/files/lalijikifigupegarus.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109101146536883.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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 11152 bytes
SHA-256: 405f25829c3c879ceb0f8246cf5b0601e0b9d3c633f567f0b4fb96c28b5a5cf3
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 17924 bytes
SHA-256: 67d3d7fa302064922cb0bcc9c011c8c0ae01967ef03bc7c8d3ceb7d363c704c5

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