Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab44e4924a1f1d5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 23:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eede424086e3309808934741a2721755 SHA-1: cca32004aa30ea50dfa74b13418229ab96086330 SHA-256: dab44e4924a1f1d5e503795e417877e75208e1a5206ab307767578691d942c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are designed to attract traffic, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=mobile+application+apk PDF link annotation
    • https://coffeetuanvang.com/Images_upload/files/guloxafenuxesumapibifoguj.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/kazekosavoxawazositilosa.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ac76d1b70770a04a37b306ce510913ef/nesuvulubinomofokoz.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/dasunutoluxuzudiru.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/56012439998.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/woxugumasajuxifajufike.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vewibulogebafotezowilujup.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc3d06089---18051321791.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109041124372096.pdfIn PDF document text
    • https://motecx.com/images/file/mafezufuwiba.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e99ab555---59434313490.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134da9e98fd0---dimarobamonimuw.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jodimudupusirodaviwubul.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/45881352362.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136829a3a629---vosuja.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/lilifurevugu.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109012123072647.pdfIn PDF document text
    • http://domexpo.ru/up/file/birapo.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zibefivilazus.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613254D37D250.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139793cb8b07---kuxiw.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vawaxuniwi.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/gimedogiretanazavalob.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e48c4b6cdcb1aae65a5894d83b3cabb3/mixumajepudomutomeporuri.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/nubuxolilupabu.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/gazunabuvulutufowozemulun.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 16888 bytes
SHA-256: 2b3eae1e2adae168108f946dbdc11d43ed26c6957d8f723a0792f6112629b0a1
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 10324 bytes
SHA-256: 68ee93311a44d768936d34df45d2928fa831ab3966f60a0ceb449d63fdfd7ce1

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