Malicious PDF — malware analysis report

Static analysis result for SHA-256 761c5a188bac888b…

MALICIOUS

PDF

92.0 KB Created: 2021-05-28 03:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e133ccbafdd4368b335ea4f8b016b1 SHA-1: 24ddb1ffc34cfd34182db147440dfe5f05c482e9 SHA-256: 761c5a188bac888b57c1e5949425dea2098f45e50b3951f7d1b9a8248d26184f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://szpital-sulecin.pl/images/fckfiles/file/davalevopi.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/77nolnbj9bbl17kv7j3piufug5/nofibuxajavamubimova.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/liwexijeke.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5d9ee114---37120319408.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608854c9cb473---fazivoburozabur.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/faik04so8id2jvue76vt0p02th/sifusupizadiveroxurowisit.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4kqpmu9hrn27c82gg2cdf9epn3/98167264025.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f9209e55235d1765e6a2c9b6b07b9c33/2985727951.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/krqpvcplr9sqm69tsgecbdvi9d/govil.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j2l9udlgc65d659op6p16ql971/bugipojibonarigujoz.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079900ae6338---5003859258.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082d26694a31---paxijez.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1e12e3b82137eb609bfa1620759d5df9/dejevimidozi.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b60d3443---57031840152.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3ba4bdb0905e2584ccbb88dce2660727/metadoxagidolujirimum.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/997d5818165e2b7678e961491d3ab61a/17406323133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manual+journey+2011+espa%25C3%25B1ol
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ddd.bin
5f46d8a0133df1bd630533193d091f74cdc1306ec14146e124b9ef7d1bd75b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 5532 bytes
font_01_sfnt_off0001308f.bin
df95e079a26d38a5e36065ac3a1faf906c10b473173d1e46ed244158e6db8dab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 1944 bytes
font_02_sfnt_off000139da.bin
5d368ef577d812475c567254f56a2d438aa66f15b9d03203a297a705fb4c5985
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 12272 bytes