Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acd1e6c050a825a…

MALICIOUS

PDF

93.4 KB Created: 2021-07-16 00:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8507b13605c6ab2cf1629f8ed1523fa SHA-1: 643eacba27effa100622b5c17d3bc6b454755d6a SHA-256: 8acd1e6c050a825ac18b8eac5d377cb9c96e9bb6380969c0571fdeacc013ed52
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=bowie+knife+call+of+the+dead PDF link annotation
    • https://iwistw.com/upload/files/84537931533.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f1832965f7d03dced2aca076db2a738f/fuvixidatokita.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/ee71756f5ba3885fe0eddc6f7892f6ee/3237477742.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/400d2fe345b4483f850004f1631f01de/jevetuxisupozuweluru.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/doxuve.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/senuduzexu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/43654462922.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/08eks5tvak8326p7kht4dhp08b/44816048057.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e42c0516000d073cbae85236ac70bc6b/mimuxixiporogu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/6p6v6fsqj1qfqq5idju32b75c7/17211150469.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/eada02ee6fa46b166b53b18957aa4b62/kimopupisemogovogawewu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5ba8c76af---39900971272.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca061165ba3---84593997053.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f7c02a53---13568159275.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///satimoliteru.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/pilumolavum.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7f25e752f4f1219ddfb4fe711b48919b/16623749365.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775cc5bfac4---mugumojeg.pdfIn PDF document text
    • https://tavio.ru/files/file/31415784848.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/42165688276.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/42411201636.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/139e2380d7ebfdf918543d306447d208/51612787202.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//fuwaj.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/q4unlt976il9muvbhuqk8qovo8/zolujowowagexomozomeb.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_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 18524 bytes
SHA-256: 576da3228beadc33f2cdf4fcf0b4c570aa07a2980c671d3084beff3b4a030f31
font_01_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 10536 bytes
SHA-256: 25fb820aa2dc4b10fc99acb54b359ecd7b238f95d68df55634bef773755eac62
font_02_sfnt_off00015078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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