Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad56452d1567176a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 19:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32e94429e2646e672826935e6b253d2e SHA-1: 091f6180232f5c7da8f3cb35c97cc6b8dc7cb016 SHA-256: ad56452d1567176af57ecac00a4635d7088cbad9001385f35b2027503b86f8a0
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress uploads and algorithmically generated URLs. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves redirecting users to external, potentially compromised sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=mackay+phone+book PDF link annotation
    • http://barsugo.com/ckfinder/userfiles/files/detujotijuxikenevulu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161383d5a7fbc1---87993848246.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/27385169730.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300d474529a---zijibuxetelega.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/zapapenokiro.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/76584338831.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c725306d0---6034500447.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/58094864162.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/73148310135.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470d86eff0d---jilusadifijoxobareketir.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fuwafibufetex.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/madepuxesorobazokasif.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/42650475676.pdfIn PDF document text
    • http://jn-zhsc.com/upload/raliwiginususux.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/71316653133.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/51428578224.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/narotido.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/rejexibezeromuronedon.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/62330886363.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/wonivafegupidazevifix.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161322a8781b27---tiwanijagaz.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/44427769565.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c4b0e5988f238edc7230129d49df1ce0/23337669013.pdfIn PDF document text
    • 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_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 10304 bytes
SHA-256: 5091adfd867253d259c2c2ea84cea144c5a759b91f75a7dda5be8e4b660c8a2e
font_01_sfnt_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 14768 bytes
SHA-256: e6039c0c3068ef19fedece577218516b5b8bd15599d3cfc9e1ce8e17b3f3e857

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