Malicious PDF — malware analysis report

Static analysis result for SHA-256 722574d87cbb235b…

MALICIOUS

PDF

82.7 KB Created: 2021-08-17 11:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2d9f6b0566118379c6c54b202fb2ab6 SHA-1: 8e87cb8be65aca864c73db6da7d3cbebbd590801 SHA-256: 722574d87cbb235b4c8d72d0211b7c191ece6b3275aad8895ec5e9970c886ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and other disposable hosting, characteristic of a link farm used to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba105b56614---13355358644.pdf In PDF document text
    • http://veterani-pushkino.ru/userfiles/files/78797954996.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/69664668644.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85c0382c5---gonipuxizifavivusul.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/66575030262.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/78407690527.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/89550971600.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/gizexogoziz.pdfIn PDF document text
    • https://ka-base.no/images_students/files/87718899298.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/zomazene.pdfIn PDF document text
    • https://o-dance.com/upload/files/lukupaxodofefuraj.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099faddcdf30---vimaxowelubosanen.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/89823190848.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/10174281481.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/13222273803.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/56769882943.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/60972109326.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896b7ce5241---40434109679.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d0594fd389add1f5f809cdb9144ab47b/13574710921.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf500b3db49---fojotamemezebasewer.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021871332534388.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/muwakomibomevazuxa.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb63dad995---10505220062.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b35259864---38059103269.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/fiwire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=can+i+eat+cheese+if+i+have+a+fatty+liverPDF 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_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16392 bytes
SHA-256: 9112a782e6f893de3c11a4559a37adad16d63052d4196d977a90285db3147396
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 10524 bytes
SHA-256: 19ec1e1ef3d9bc66635c14200ff98df65565853e015582a607aeb8910601d22e