Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf4effae987b29c…

MALICIOUS

PDF

97.0 KB Created: 2021-07-16 10:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a50028cc19070c521a03893885f70677 SHA-1: a1408de7e1d594756b47a5688b07acc08abbf10d SHA-256: caf4effae987b29c07aca768aa5293896fc901faf00e20d403f7c762fe9db88e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm designed to redirect users to various websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. While no scripts were directly extracted, the nature of the link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee883b9568d---pipiselujajoj.pdf In PDF document text
    • https://aaaxxion.info/images/file/tawataxikuridumuginikovig.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gnvnopkg11bbgu8cr11ofgl1ba/21090442270.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607264583c436---53656454382.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/pupefuvigiwekinet.pdfIn PDF document text
    • http://jump360.co/upload/files/20210616001313.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/82958546090.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/67785491394.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/97994469975.pdfIn PDF document text
    • https://kuepancong.com/contents//files/vudeveduxin.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ac769208d3d---xoxemafakabamupafaki.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/4552657962.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/eg6hdat1g8nj9ac7e7u114lgfj/88264139698.pdfIn PDF document text
    • http://ipllaser.in/uploads/5098185124.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/44191175325.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/511867364cf818adda2d2cfd139e3315/86607067644.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/sivuxijipigofenen.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc48fb94cb---fejebub.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ev78hcn8jd8ba4uvt6a92dgv43/4389194311.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e8383d56---murametolijakibeji.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1a80142220d78586189d428f0a58de7d/2864909176.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a5a5560ac4de9a9e20954c3fdc6b311/tapowuneju.pdfIn PDF document text
    • https://ms01bet.net/contents//files/kuvufuxotesarigirer.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c15c7d1ea653366281fbff176109ae4e/77060627298.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/jonenake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dictionary+of+cantonese+slang+pdfPDF 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_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 10912 bytes
SHA-256: 6940ddb2257bd0918d4ec6fa252c04e4583b276c41cbabf18793655430db029c
font_01_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14783 17988 bytes
SHA-256: 8fc2427913cbd330917533adf7c365f18a746721890210614dc728f4114f2336