Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17f65af85f69934…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 10:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ff6c3320995e6322322d342a7ec794a SHA-1: 0306c8e2f1c4c707508eb2bc61f7602dcf58f088 SHA-256: b17f65af85f69934387c7624c2cf682c3c52a482ecae15696be9d08c0f792a5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of multiple suspicious URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=buat+aplikasi+android+studio PDF link annotation
    • http://thuocamakong.net/userfiles/image/file/xuvaruvokepugagujuv.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/bimonodib.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1bfc15cd26ec2a4155e06cd34b630ce4/50455548833.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/68373940247.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/guduwojedo.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/valulozirigiku.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/kebekop.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/wufafomijotumutidinogana.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/nulowefel.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139990668cf8---27668745604.pdfIn PDF document text
    • http://kammed.com/userfiles/file/murutudadabironitagelumi.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/ratemi.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/94752242080.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/xeduwuwixapojijokunizil.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202199_18359_605.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/xenofug.pdfIn PDF document text
    • http://cycling-software.com/files/file/50026092912.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/3199220380.pdfIn PDF document text
    • https://izometal.net/mm/file/96734321171.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fafajobijovum.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/44748392974.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130686ed4dd9---videzogitukuzojefapa.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/zojasaxele.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10496 bytes
SHA-256: 231dcbd83a4d358eceab5ac9931b9a5e5f0ff74d9ac472b4e55926b9f25352d3
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 16280 bytes
SHA-256: 5d6ffc8bdb5e8d509eb1855b6c1fe6af051305fc86f4644a2845fdd892ecf806

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