Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a6cc0abdfcb946…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 500621c60229486c26afbae6c43e90a6 SHA-1: 3a2881fb58549256e89d7ff56186051aa3ad5ec1 SHA-256: 71a6cc0abdfcb9468da0f9fed8a9bd8bc8f6c4afffeed8f5337f2c64b72fdb2f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple compromised CMS upload links and SEO-disposable link farms indicates a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://esipro.fr/userfiles/file/pofalefimoxowarutaze.pdf In PDF document text
    • http://runo34.ru/attachments/file/totezinupubefizofav.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081628dabd26---40409792274.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/zezapapipadij.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/60256508186.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/lowavililetap.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/dowipaxugomozifamos.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4a98f5f0---13887494406.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161140c4387eb7---566277876.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/85372894e69229749da30f43390f0fad/biwijivunugavugimoxatigis.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/72560697091.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/narijiju.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqh556iv8c1dd7dvbdu4319ee7/lubobojafojesonok.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607398591f8f9---juzokunatoka.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/84413552587.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/kunotukusega.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vogetanudasokula.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/85215841273.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b2rtnbm9q9u4um7r0nuds9slu0/wivipunegopukajiled.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610245e612fe1---38953584484.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/fadezagekedix.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lua0094891666jhmv2vpk9h2u7/xowudatarefib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+can+you+feed+batsPDF 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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 10684 bytes
SHA-256: 0e6bba17c8aab50030601f58940e89fb7d95badf35c843b3ae467fc058ee9b0e
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 18828 bytes
SHA-256: 71b0ba4df880ecb4585f926dd30d29102da400abab89d2a9edb35007e2ace686
font_02_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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