Malicious PDF — malware analysis report

Static analysis result for SHA-256 e985f9b212ee85cc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 09:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3ce0b486aca9209348ad600eae6682f SHA-1: a7dadfc1e5a9cfb3552e735c63f6fb7ded496143 SHA-256: e985f9b212ee85ccb3c1dbe9dfd9837ff2dd27bd349ae35f2c7298823ecc1280
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to various PDF files hosted on compromised WordPress sites and disposable domains, impersonating cloud document services. The primary attack pattern involves luring the user to click on these links, which likely leads to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://samsunyapi.com/userfiles/files/3507379070.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/dobul.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/84973ba6fed68813885197d67c6c1672/4634810801.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/powapigogafutarukawedibaz.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/90015393759.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/33578291980.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/87257231603.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2db042162b8f7ad7cfeb235438cab533/62030302081.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/88028352990.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8439966ddad242d10039c0988e90bf9b/24578269535.pdfIn PDF document text
    • https://aitalk.vn/upload/files/32160626401.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xalupurog.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/birobawub.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/dobositikona.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/73214157715.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/12/51343592620.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/33251509779.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/dogolafatop.pdfIn PDF document text
    • http://atrsara.ir/resource/files/22317145432.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/14234384040.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gefupavedenoza.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/gapukozuwat.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/75006589792.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/sujiximosof.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/93980471788.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/63176155539.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/45530285393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+reader+apk+modPDF 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_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10244 bytes
SHA-256: a68f9acc066562f2241a325e4c70b2c6779fce01f0ad508bedc50c89bac2a6e6
font_02_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16164 bytes
SHA-256: 00842756ff03d13f731267ae7439d5c5255a2912fb0161e4391590440c8c0c50

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