Malicious PDF — malware analysis report

Static analysis result for SHA-256 45caebabf1fee00c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 02:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3f99f27edacb8831f1f46a7dc477c25 SHA-1: 4c4e0e3f9919a72a65ab3e534c4400c0794f58da SHA-256: 45caebabf1fee00c8b24aaab374ad3e28f29d8e88f1f85b3ef8218597abbf9d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://somsit.com/ckfinder/userfiles/files/65419175618.pdf In PDF document text
    • http://elistaprezentow.pl/userfiles/file/fikalomogadepigi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/90654777882.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/dafoxaresafotulugalo.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xujupofibalanibalixedutog.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/98920402133.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d8c504c0---bufarabedavokufod.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/86974703257.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/jasesaxojufuzipa.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/86222811847.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/81169461977.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393320a3f02---91583396984.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/maduximav.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/41208552498.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/remisufozes.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/8411470983.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/30935400754.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5bb7e8bc8779f71cb9e32b2dc9cc247d/xudukoxi.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/78257947761.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/dexupogulasemiwigiro.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/64935273911.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/wibafejorubagafelixu.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/kenojipawapovowebejati.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/53738258236.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lafigimoferofevux.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/puxurim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+causes+zonationPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16612 bytes
SHA-256: 517716dd4840bb1b67a40cdb5535975e2c10c236e3d0366dba97d2bcd99e9237
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10336 bytes
SHA-256: 9fc93d0d22f05a31cd9340b9ac80aff7145667446876ba1173f11fcd063b59ca

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