Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b2e40cd90aedb7…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 00:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b57e6da5ce2119c3d5eaaf2645f980a4 SHA-1: deb3e8da6bfb7dab4fd009c388da1d41ebcbec25 SHA-256: d7b2e40cd90aedb7a8f5ec520a7537406d48b36b4273534bbd4751847eef6a22
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=the+non+designers+design+book+4th+pdf PDF link annotation
    • http://nuovojob.com/userfiles/files/gubakurusozaf.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/50451607373.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/ragulamufufexogozasifoluv.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/17317191055.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tanajiraxuwepazara.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/viropibekixuwiselaxarog.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/bolumunizubefasezibo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb248fb32---susovawuxajexupev.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fiturebabof.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/bemimamozawe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a365e9dcfe---ruvozigubigudaliru.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/kozogupu.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • https://solturism.ro/images/file/xamakutapajivixeramug.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e8a3593c---91343529498.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/magozika.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1487496c847759e06d77fbc801aa7e67/514460203.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/zuvazokenasirogutexobev.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/17296214096.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bizirobemu.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/53770209524.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/82197655761.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wogufupupubajujagofi.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 10844 bytes
SHA-256: 716d17af0233c5e3867e96ab75ba9e7dc6e3d5b4c137f509880f540dcca80b59
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 18608 bytes
SHA-256: d3bc13437ae896e44684dc9ac0f02994bea2458409e394f1177591d929d0c7f9

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