Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce18a5d67875c10…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef85cacac40a117e03773e01f5f093b5 SHA-1: c3e8324076da2fa3fb541f7fb54b12956d0b0199 SHA-256: 7ce18a5d67875c1013ac22672fec88a87dff039d4033575282a1cfc7a086c7dc
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs, many pointing to compromised websites or disposable hosting, suggesting it's part of a link farm designed to distribute malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to solicit sensitive recovery secrets or private keys from the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=ftp+transfer+android PDF link annotation
    • http://matchedtubes.de/userfiles/file/29278217706.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/29066570683.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/87029086502.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/dafokefogomivekideba.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/29242055499.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/18500080675.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3e5a884863233b591759b603a81bb7c6/21606300913.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/53135873617.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/zalinixewiveravokevu.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kotizenegolevelefagefet.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/11810818318.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70738871954.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/fodajadodogegitetapejebud.pdfIn PDF document text
    • https://suruburi.net/mm/file/11411729104.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/45958118926.pdfIn PDF document text
    • http://honghuibio.com/d/files/72572051726.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/58773894038.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ll6c4f6a1gk5p6q0qi91dsqns6/52904614272.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a7a13735---xaxukanawapuxuzajawoweno.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/jinuwiduwaba.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/30716236707.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210908111218_sbc3ox.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/59647925807.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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 18916 bytes
SHA-256: 9135e6869887d8cbc9aaa7b64422220dee205618c75a8fb729e2d226336a5f43
font_01_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 10424 bytes
SHA-256: 7987fd0e6c4abf74449da274ee851890e061072ccf7e97ef130428ffc0f4e571

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