Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa28d0289576be3c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 02:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 55f0409240522cd133b7dd1c0e6fae23 SHA-1: 826fb9b6b76d8e751f7b8c97c33791f492419f69 SHA-256: aa28d0289576be3c0b116015fd4c6d5e3ea228ecc6d945594b2bf27139f6c146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links, particularly those with 'utm_term' parameters, further supports a phishing lure, likely attempting to trick users into believing they are accessing legitimate services like Office 365.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=office+365+mail+server+address PDF link annotation
    • http://cnc-ar.ro/files/file/jogoxinudonopokozesapiwab.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac17d52a5---76951927717.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/74571442325.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/85954443577.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79548cc1446acbaa6c3e5189817bcc4e/bafewisajezezuzidu.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/busebe.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/digokovova.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/webepegitetuzabaku.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/fogimafifotarowirigidu.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mulewetepetojamozogak.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444a434f509---45162530363.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/93981521303.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/zixejobigujemawodebuzaka.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/20959579984.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sutadewet.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/bopudu.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/sasikejixolosivanu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a148a5721---maxigabupujijugatudu.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/14287558479.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/zomabipekomibikuwijiket.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/surulefilovososus.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/kavovumejoruk.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/sarujigurumuro.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/nanuxowesamobuzewav.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/67258977896.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_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 18768 bytes
SHA-256: 719444cf840057c78bd79b6954b3b4e16751f80844c463c9c412234eb249717d
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 10880 bytes
SHA-256: e08f592b06c8f24257afc8198f1f22edf9df6c2213b018614065442a08431854

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