Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8a97969a93a080…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 18:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02f6e9b58a17a1d2a2f827b9a2558e5b SHA-1: 32efdfc5e23cb1a96a0376c250c2fe982c557181 SHA-256: 0a8a97969a93a0801e06888b4af4005b5f56d814dfa0bf8cf727f0fcad0ea57b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://trompis-tondschungel.de/userfiles/file/46229327401.pdf In PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/tisujaxaresiparow.pdfIn PDF document text
    • https://eguiders.com/uploads/85156997199.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vogesevigitefufif.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/wafumodaxosewa.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/11674629602.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/kuxuwogudenuw.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jimolakorowodibip.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/96501866815.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/furizezejazowak.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/62495098507.pdfIn PDF document text
    • https://arendic.cl/files/2217728155.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/28473738457.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7690a18c8---36925216937.pdfIn PDF document text
    • http://mobiliteit.nu/files/90073176635.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/vuxopalamediwo.pdfIn PDF document text
    • http://rococosofa.com/files/files/mebupewikejikujeremilufa.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161362dcf01769---95034444984.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141756d436c0---23611284494.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/59146890754.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/36463802716.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/tizejen.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/57570104480.pdfIn PDF document text
    • https://vpmemorial.net/images/file/77199959020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+note+9s+camera+featuresPDF 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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16192 bytes
SHA-256: 8b5f3893fcdba32b9b3f2d7292578ed660c4e90dd9ba9d2a718821eef8480898
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 17860 bytes
SHA-256: 8ddfb9a6c6bffda01f432814f97fd3d88816efcac93c193e0546e892a9008031

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