Malicious PDF — malware analysis report

Static analysis result for SHA-256 180a8fb38402c9f5…

MALICIOUS

PDF

81.3 KB Created: 2021-08-29 01:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48970a9f9658b1103549b7c12585e1f8 SHA-1: c67e0609dbd2b3a86580cf0ff4f91d4fd9d5934e SHA-256: 180a8fb38402c9f553feea2b7b64abac876a54d3696ff2b023770125515df24a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are compromised WordPress installations hosting further PDF files. This suggests a multi-stage attack, potentially for phishing or malware distribution, leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://zegabilisim.com/calisma2/files/uploads/42173060087.pdf In PDF document text
    • https://alihuata.com/userfiles/file/49789848059.pdfIn PDF document text
    • https://bem-sa.com/img/file/35397283036.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082b2f408adc---dobazamejimivarulikarave.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d0c11eb88---97979068823.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210708_122758.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887ee542a0a---67000716663.pdfIn PDF document text
    • http://tcihk.com/userfiles/94440081278.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/devanesidusobomorimumesi.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/pizenuwifafenabeletarota.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/17876207351.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3baf877---47940586231.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kifefufopesasapitowubak.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/muvaxenusekavuvumudolavuj.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/67285922521.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/wifefa.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a21e4d2811539ce2d2553086be79bf48/35260822060.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/82171185538.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/92517000141.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/df01a3bfe7c719a707f2307ebe039c0e/56387446728.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/guborisu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17272504203.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/saroxajodirizuximi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cbmiuekprn5d429pjqc9tu5cm4/xesimutexokuk.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b65c599da31e2a47764ba177f4507c48/53432449398.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5a124fdb1b22796b604a6a2af39f4b8f/pigenukixusibafixegavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convert+pdf+to+word+with+imagesPDF 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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 18004 bytes
SHA-256: 5dc7bc1b838a27b69d7d5389aa7a7ac3baa841aa3ef32f2c996ec2de874cb3f2
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 11080 bytes
SHA-256: 13ed5fd2ee022ec819e1b6b6ccee37c09671a6cac2de5331c4d9661c9a21df5b

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