Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87afc7fcd8c46de…

MALICIOUS

PDF

96.9 KB Created: 2021-10-08 01:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b235c09127cf8e651979b1a63ff3523 SHA-1: 67c135aec00efc01695b6f16bbf363f7b3a9c47e SHA-256: a87afc7fcd8c46de7928706228152ec9a575801f6e2957e669c07b0a185a04c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://dazhonghua1688.com/ckfinder/userfiles/files/fedomebuvube.pdf In PDF document text
    • https://tttinox.com/upload/userfiles/files/janikurobidusexevirenofop.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615800262ed64---31272289342.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/memokoxegevatowaxolelu.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/govapuxopevelaj.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bb8f468eb1e0c1350eac630aa31f1924/55299972798.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/93203146926.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/41003720734.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/29751909735.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/85b3c612cd31c00e3ee8cb9a70e18636/42324812324.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/denebiguko.pdfIn PDF document text
    • https://krusomying.com/data/file/40218146666.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/linonosuderoteron.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/sezubodoweli.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/lubawiweturawuzasularuva.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/88689800172.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/64207553472.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/parulogobuwu.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/sojogevatosasuxafinudusi.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/mopelokujatutuboremilo.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/48773656269.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155dc12d73fa---96822433343.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/dufivoxusazij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scrum+interview+questions+pdfPDF 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_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 11044 bytes
SHA-256: d53208c093fca4e718763c855bbf7c67d38a598dfee38d37b40111256c7d2452
font_01_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 20600 bytes
SHA-256: 2d41d0982b5093b1b9f1bbf5a73eab43197d45c23e56a99226a6d52e95c93e8a