Malicious PDF — malware analysis report

Static analysis result for SHA-256 362941cac8557c32…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 01:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5daa57a366d41f78fe7368ad8c5549a4 SHA-1: 6d217390a1fa89fd3adb2cde09504a4327b1dfe7 SHA-256: 362941cac8557c324d78c318adbed59fc294cd8b426e3e1a1bdf6932679fa946
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple compromised CMS upload links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0df7933b461dd888ecbb824face197cf/zigojuravobop.pdf In PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/nororozijijusefofimupexev.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/piwegozagatagidutu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/388c4c27757dcf26728a1f50db1c0a81/33171959121.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/mezedurodeseb.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/misokojevunubodatugivid.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/53fc5290908cd89e5e6236987b5f4798/21536419985.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/kupekupejole.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b16db6bc3---45618141692.pdfIn PDF document text
    • https://scalper.ir/data/files/file/8644190843.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107140042463584.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b8fba8e9a---89471983025.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/63c13b736cac2f8c62573fbb42afd22d/87411579033.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jikizajizi.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/dujibilowokalejijudip.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072df115b6---pelezezelozujoluxulugupo.pdfIn PDF document text
    • http://canevastoilestjean.com/upload/editor/file/58348867843.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/97315166887.pdfIn PDF document text
    • https://blokhol.com/upload/files/ziriwirazikaromufuludefif.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sulogilaguzo.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/40921165002.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ribupoz.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/9tkobn32ekt8emidb8emjcqej6/3750463903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=singapore+math+worksheets+grade+6+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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 11320 bytes
SHA-256: e00b050388914b9f5147693a3000f64e421477e747a74927f74bdfd459d97f53
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 17320 bytes
SHA-256: 95ce9d8be0a670d217b82d0eabf7ef79e3e7ba8f5652b749ffff297ab4f76996

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