Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d931f53b421f04…

MALICIOUS

PDF

90.3 KB Created: 2021-08-04 04:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e87bbf27c6ef2d335261784d1c27ec2 SHA-1: dab78f1854a1836f0b3f245c49e7766baaeb4aa2 SHA-256: b2d931f53b421f049cc9c5fa94e6dd07a007cbe06cb6c755c36f2f2fcd04f421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics supports the attack pattern of directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://hodinovysoused.cz/upload/file/39521956174.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b076a9b61f---47210088748.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/nolifo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4daf00a191---62571236559.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/33255211274.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///60361196088.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/nudirer.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/to552kbnkuqtc78igmerqrbhi7/80326935005.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/35321101011.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc51b4ff3---pajinovek.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e329a8af04---68766376142.pdfIn PDF document text
    • https://isleo.com/i_photos/file/93513160411.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/egb74q5dtfngbo7jmh1vuv77ef/jadowidosiborelusabogo.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/dcudo0bk8f3q5hbd5223gpsulu/nibenudulizubamokisuk.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/getowofuzulufud.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6958abb3754e5f14297d22db821d96c1/64424977629.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c871797817b---roduliwur.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/nifupexuko.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/38804076717.pdfIn PDF document text
    • http://vtaky.sk/media/file/koguzeragelonamerusiko.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39e1c3200---96704448016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=is+voldemort+in+harry+potter+and+the+cursed+childPDF 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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 17676 bytes
SHA-256: 1c9ab55b98a98f0786fa1bcd36f9971957cdfbfe6adbea8f47adaf8e356af436
font_01_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 11012 bytes
SHA-256: 57de8bc531c969ebb6503b842508c587c0331d2dbe9e029e84870836e804e572
font_02_sfnt_off00014234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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