Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43b4c0951971cdb…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 23:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24579fc7f02214af14681786e6daaca1 SHA-1: fca1b5451aabfa392a6eb10822aba82b929c5bd1 SHA-256: a43b4c0951971cdb75518cb18234bc9e11457393776184f80eed5004cfe65aa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'SE_URGENCY_LURE' heuristic indicates the document may contain language intended to create a false sense of urgency, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ingpoggi.eu/userfiles/files/demudelew.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160785dcdafc6a---bepotexizenuvexuvij.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/70965886423.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/bilopiguwitukulu.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/monivixiza.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/85581447111.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/juwizesowewuzas.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524091305155.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4ca508a4---38012282498.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/52287279945.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o2qi92foqj9nqjpvhcviu540k1/posowuwaturutipakanezamu.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609722cf3a3ef---vodakenuwolezasavuteras.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nevisazolog.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd487181202---2983485326.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c6f6e3701229d648b03e13a6c3ce7208/xabikoxi.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/bivodogukuvo.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/bisalakuxuxuxagawuwedinu.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/jawatavixurodenajini.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/29565597478.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/30197961920.pdfIn PDF document text
    • http://cmtsport.com/pliki/surowuwiti.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ae4ba1d7---vufezazekubirek.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gbn9q68hrtliebc612s13o3p48/60465688477.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4g5q6lg6i11d2din1e3886heg8/61017767069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=equate+cool+mist+humidifier+troubleshootingPDF 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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 11292 bytes
SHA-256: 62194ab8c1e6a0af2f9d88e3773bdb4eeeb651a68510fa17e149e378758f2d5d
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 18624 bytes
SHA-256: e79b37c68f48429d0276fe1e418396df374e12057efe792b8ed9bb44739ff2a1

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