Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d572cb26f2bc59…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 03:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 706b99d7c6adc301552065009ddb83ae SHA-1: 868f4364235fb570ec834ebbfed3fafa6883949c SHA-256: f1d572cb26f2bc59fa7880ac751691fa56ea26b25fc3ce2f687afb7dab2df285
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=broadband+speed+test+for+android PDF link annotation
    • http://shijijiaming.net/filespath/files/20210912122455.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/97449877983.pdfIn PDF document text
    • http://schokofontaenen.de/idata/naxedibapi.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/37222535828.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136902738c61---tumivuzesexirerafe.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dibojavoj.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/falewetekujafop.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/nafanoxidolilumowixowo.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/bedamujigufupimomo.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/nonudipodu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/80515177908.pdfIn PDF document text
    • http://hanauhrova.cz/files/79603645316.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pajuzojuzelozazivuzuzeman.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fawojijonexowevive.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/40658492238.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/fizovibabuvewapi.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/99604287274.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219222055356303.pdfIn PDF document text
    • http://abwessex.com/uploads/files/94548539961.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sizibiwu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3k876mnm8oravmfjtka09b0f4m/puranevegove.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/towewaritodadavumepezu.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/78611498598.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/niwawonelupoturego.pdfIn PDF document text
    • http://hzqzg.com/d/files/senarokajikuji.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/373a9b537fcac3ff62b501bfd0927a00/jajagafekapodawof.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_off0000bcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF6 10636 bytes
SHA-256: 4b8795676940ef957bcbd266bf9a242a45bb743c24a4404f31f9537c92579ba2
font_01_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 18612 bytes
SHA-256: 61db3ef8fa7b1bf7ea200a1b5c1ec3b9106c92c3f2f7b8c3be6c3d286f850997
font_02_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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