Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d2498074a9b408…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 15:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1c7b878516b2516bba7e0ca0dc186bd SHA-1: 182253fbc442ce571686ee5a32c09dd43d167d4d SHA-256: 55d2498074a9b408cd8595224cdcc67eb235370bf615bbc5791c627663238e52
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853d39edd---jidedifetubujuzifux.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c73872db3f7---tizivazufazadejiju.pdfIn PDF document text
    • http://guchenes.com/d/files/fugigew.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/96612564975.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/julugalo.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/45379843761.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/sagigexobobofolugerom.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/80480530109.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/30464656581.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160899638e9f97---jatutumevabu.pdfIn PDF document text
    • https://gangnampools.com/contents//files/72271239810.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/62197b7f919f600df4dc7593edefb3e1/bugidegunozapupedejuw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6497db0d27ce2fb3cba12a70f151ff3d/fuvajip.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/38256345964.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/jajepuwaribam.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a64eeb4b---60671507223.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bosaneselutorevelarokum.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t5tu6d9jpg6g0ermdh5ldeh4cn/80613860747.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0ebba87434968e58a1a1c6f69b174a5d/kuzipufinenidukilis.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tuborifixijonujil.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/30837325837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+mengubah+pdf+ke+word+di+word+2013PDF 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_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 11548 bytes
SHA-256: 19737744ee4947a7848a4df8719ec9dde698f741ead345269dcac4c5b7f5d201
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 17404 bytes
SHA-256: a087d0b94add8647e789eefbaf2fea6c9a2242d346c12f4e90063e90a6258b43

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