Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77f23e488524a5e…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 19:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9dbd827ebd5c4f4e21a81945836fb88e SHA-1: 30a35015814de709369efc82981ace1d06c1f8d2 SHA-256: a77f23e488524a5e4b8ba6661317119fa88039ea0992879562d2f34b7220db36
156 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 ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external URIs, many of which point to compromised CMS upload directories, suggesting it functions as a link farm. The presence of these links and the ML classification indicate a high likelihood of malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=sex+3d+games+for+android PDF link annotation
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/weref.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5d7477556d7578f761a6abf9a5dcc361/nalesejutokanijunogomale.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143593f76791---67834676142.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143267468b3b---gesiworijumovalezamizi.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/bogigajonolagoju.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/72590458849.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092614294973499.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/95592711406.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/loketasuref.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/lufavanakigorizedenegob.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda43f390d---327113403.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/livelofazudab.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/90050605347.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/luvuwijerufujukono.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/pufitubebagi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d33c2f854---483382978.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/3337711076.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/fuvegut.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/55266442284.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/bazezemijasukurifodanut.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/retaz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b504b26ca1---subaxokowonetimejokese.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/28142780678.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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 16532 bytes
SHA-256: 2bde188d237bc872254314b4cad8cc8cb8d71b5660778f48bfcf749b3e87a2a8
font_01_sfnt_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10904 bytes
SHA-256: 5203a771a969f2219b0278657c460a27028fc390d823e4eb30bbc0d2636928cf
font_02_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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