Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cbceafe165da11…

MALICIOUS

PDF

94.1 KB Created: 2021-08-14 06:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3d1f80ec9af1cb033968179ac05ac077 SHA-1: 3f617b90dff342978fe3916e0bca30cfe68b8bda SHA-256: b8cbceafe165da11062b97142bab34f38b5603c46c53034d81ff9dcd6196dba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://mtreurope.com/ckfinder/userfiles/files/84946547883.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/nj83t56qadpm5aqhnref77rm71/bawebobilajako.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6f267d29b83ef7621443aeac7589a9bf/6714987088.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21eb0feb7---poxazomik.pdfIn PDF document text
    • http://strandedtattoo.net/file/68855311102.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/20013231039.pdfIn PDF document text
    • http://talleresjpg.es/img/file/86889875635.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/5743426827.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160743a4817190---tajolepupapuzapebewuka.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lqsspqibalid8oc8vavikacjh1/davafapamim.pdfIn PDF document text
    • https://wsbtitan.com/images/file/14887678366.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6p46v1j20012j9ck9c2jkmrjkp/vewumuvafimapugi.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/revapuni.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a628680e25a---52918998530.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/bu4dj7vpj3ilbosve9glc2es1m/jalawopoxureredupo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/39412794107.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4876989c05157b8fa250650828cbbf0b/14513427850.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6acabf0d982adf6ad4cdf74b72fb11d5/lesuxifefenirepepe.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2c7b55e54---61328133804.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/11756109307.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/gokopijetilibuge.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/83736251057.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862217b0cb3---32992002958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=automatic+call+recorder+free+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 17812 bytes
SHA-256: fcccaa9c2c35c3691be1b645f20696793c49acb1d6b43178f0c2447c3b5abc57
font_01_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 17240 bytes
SHA-256: 5cae5eb67c21ac37280d03f0c7dc5f36eeec5bc94b1bae8fcfe677c3ec38555b
font_02_sfnt_off0001395d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15174 10680 bytes
SHA-256: 6b2e3411789158964701be385bca2f33227d9d0c50ada0e4ac073b7f563f50d1

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