Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af08d7054ea0385…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 07:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73a31af9ccbc6c488b7f5d3e195cbd08 SHA-1: 10e6217d6159705fd69febddd7eee2f8ae419aa7 SHA-256: 6af08d7054ea0385e36403104a519316cbefc8b3918280f2fb67ee549151d050
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of an embedded JavaScript stream and multiple external URIs, including a link farm hosted on potentially compromised CMS uploads, indicates a malicious intent. The JavaScript stream is likely used to execute malicious code or redirect the user, while the link farm aims to obscure the final destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://avsa.org/sites/default/files/images/files/leferedejurewometebiwaliz.pdf In PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/337248442.pdfIn PDF document text
    • https://angkagenap.com/contents//files/xosalerapadodegaxijiwar.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210624020050.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/selorotujepiwaxizezerog.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1629946263.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mavesam.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/bafujikesojijivamaxewe.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087268424203---70339696437.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9flsvuv8pegpndac3v2fpgqgti/gegolesajivog.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/sobidaxi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102df622870f---rifima.pdfIn PDF document text
    • http://piecco.eu/upload/files/vigotajivusadaxevuvip.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/73940809875.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/44095832903.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/18196997314.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d78bc2932---dupedaxeg.pdfIn PDF document text
    • http://brlairport.com/images/file/gonovorepupip.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127836a84e33---wokupeluzunisawur.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8eaee30a8---ridumiz.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8mpc38b1niln58q34aummse7ne/dekizijun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=types+of+tramsPDF 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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 15748 bytes
SHA-256: 06bb5f7ed290a7800d410e1e851e698cbfb736ab207a6e00c5f7cacc4d36a24d
font_01_sfnt_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 10352 bytes
SHA-256: b6d986b80ed33c02aa76bcc1db39e531015198623dc851abdcaeb8542f48a4f5
font_02_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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