Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5229c1580bd906b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 11:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5609eedc04ff055fc5fb68ed4aa978a SHA-1: 8b224de070d012992d221c3fc850826b5083f015 SHA-256: e5229c1580bd906b3d9a26b24c542bdff34e47c9527b3868ccd1f8bb06628ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document contains numerous external URIs and link farm patterns, suggesting its primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=logarithmic+properties+pdf PDF link annotation
    • http://dental-forum.ru/userfiles/file/vinawedidojunisilalideb.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/27554242361.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/gibok.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/94294b522c41389f43c6a57427128b00/45903481802.pdfIn PDF document text
    • https://aashianarealty.com/file/xiwegebivif.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfd137080---voweguzebaxasukaxagox.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d834b43790---10103884537.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/94606903098.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/bulevatuvoreziwonaluruji.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/u3hjc4iau9q485ls3c8t3gj5s8/25477379481.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/79702875184.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9dd4a1d788df7b7f3d25c78f1abc4213/94976957074.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/83473308617.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/tumorudi.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/mamosedebunudonupurizonu.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/zefunenumurapeluf.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeeba5472---96368132277.pdfIn PDF document text
    • http://cutskytools.com/d/files/sifadedutukaxajivopinagez.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/xigazeduf.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/xibokariduxekolijev.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6afadb13e---51710240019.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/riwekusalizimebe.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/57951576284.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_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 18804 bytes
SHA-256: 6c63ea09af0cceecded730c19f8ee754eda739bbfe575d68156da72eb464a28b
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 10872 bytes
SHA-256: b65c1179bc3ebeb1112ad9bad0a08312311d05135e04dc9a1ca817b557912510
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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