Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b01b54064eb28…

MALICIOUS

PDF

89.1 KB Created: 2021-09-21 04:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f74e25a82578ae4c3d9c3077e76eb5b SHA-1: 94b0a06a80a2d230ef730e2c9ad5ea3efd7aac5e SHA-256: 900b01b54064eb28ef58422649a2b2c642b365c24a8ff15886ed08b02a60f171
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised or malicious websites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this, suggesting an attempt to distribute malware or phish credentials through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zhengfutz.com/v15/Upload/file/2021917849231346.pdf In PDF document text
    • http://simonide.org/userfiles/file/96293279978.pdfIn PDF document text
    • https://proxus.nl/file/lozizivaguwububivubefu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/8017c3eb92850202cc5b1ffbc27ee4cd/namosisejesurujasipukulen.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_3BF0C837B54742DE.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tuxivevibiva.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/kibatudaz.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/kawunomakikesezunopidip.pdfIn PDF document text
    • http://ilovestory.com/upload/file/dumozazami.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/54141938846.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kasapi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/70053458142.pdfIn PDF document text
    • http://demkapi.com/resimler/files/75698932348.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tezusilulotojaga.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4483eef5a4c47ec79ccafff95393cb70/wamipuxutetakena.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145df4c7bf00---derirunivopewomuw.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/maruvoditagorof.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/37543049760.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ahhqq889jlrbr558c29huffmlm/pitug.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/dusibegosadawakigesi.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/84997213530.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137a23bd9b3a---15304979481.pdfIn PDF document text
    • https://argumentua.com/i/file/nimajoweviruviroxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+run+apk+in+iphonePDF 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_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 18928 bytes
SHA-256: 38ad81ee37e6ba9cb54b215bf931c50e85ccf56c9004e05d8f03f8c75d062f0b
font_01_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 10404 bytes
SHA-256: 740fe3014f5b2653db4b7a632262661952b1120d6c93992df7a95d7b78d3f053
font_02_sfnt_off00013ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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