Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a180858b082d205…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 01:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3fcda70494af5828a794e1d9716b58e SHA-1: a425a3387ce7e72213acf850631911b50b9d314b SHA-256: 7a180858b082d2055fc131f335e7166faac83b37eddf44d9730c5715e18c2beb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ettermanenterprises.com/ckfinder/userfiles/files/muwuwoboduvi.pdf In PDF document text
    • http://dar-tom.pl/userfiles/file/26851524863.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/gonidewapivagiketawav.pdfIn PDF document text
    • http://sbairs.com/datas/files/noxigafo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/58770e86d01074200ce0dc30b10a0721/26508482097.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd95e3edb7---90467872368.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/61817780758.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/winakamitinudadewisixudif.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0mhq9fk47cq8eeafpfi24oki5j/rifezuzikarefonuxolemu.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sesowevoxagugogixegax.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea525652af---56216045454.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/wosoraxuvetebod.pdfIn PDF document text
    • https://membermimpi.com/contents/files/1488642878.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/pedabosumenorebonajawuse.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/31542602202.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/nonefasutanom.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/webabusumoxudivixopikeg.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/509a64fe21b357cc1bb54ecfc1d8caaa/fidolorozejixupapobal.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f4d9bca---jikomibujagurafukala.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/lapevasuzewoxapux.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/rusuninezezamazugemo.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kulevapakekajirotip.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5e272bfb7ae53b5f19f0438c5bd86309/folujasumanuziledupel.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/tobuliserurik.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/93535125418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=blokowanie+numer%C3%B3w+prywatnych+plusPDF 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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 11220 bytes
SHA-256: d48effbfa24ba8b1e87827d317140f5fa4dc21388945461894a11865ba432301
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 17644 bytes
SHA-256: 8ad08daad7724eca12b95ee00f02a448d06f0a74fe00a033020d24bf2b6be1b6
font_02_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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