Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a43bd2b90d6b49…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 13:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 115f9e016f5f16b156162718d7a5f3b6 SHA-1: f59b5215c0acb3b1c81cdbef99d48ab85e76cdad SHA-256: 49a43bd2b90d6b49cb8867ccb93c4b5c27ab110026238fd19310cf9804cbd257
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It employs a visual lure, presenting a screenshot that conceals clickable links to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded JavaScript stream likely facilitates the redirection or further payload delivery, contributing to the overall phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fatfailogistics.com/fckeditor/files/file/genibunubamobumopazatowe.pdf In PDF document text
    • https://greenlandpark.com/uploads/files/moposufonutubasirutufeb.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/35618494163.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/dudopokowunugid.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/826ab5c7aeb758dd4bb6f570f8dca36a/40918696830.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/88033835786.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/lililepe.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/97653982485.pdfIn PDF document text
    • https://suruburi.net/mm/file/72512693796.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/mipizarunexitojon.pdfIn PDF document text
    • https://tomas-music.com/contents/files/jadadijire.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/feziboxofekane.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/panabesewewunuxuma.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d0b3fec11826ecb7c2a7de9450fc2820/jezegoromarubofuxamesomar.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/zexizejififefojudorijub.pdfIn PDF document text
    • https://chv.vn/userfiles/file/tewanubikipedumakikowovo.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/32939024221.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/zudupebajetaduve.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150975c3e9ef---98938142221.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vsl8jh569nugfoqo0k914nmt7u/93082923697.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/uqovfqdmsg2ejvu3jh3cco8a49/lasikemavexodiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=describe+the+different+layers+of+a+rainforestPDF 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_off0000ac75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC75 10828 bytes
SHA-256: 1b11df7dba07f6cb7a231cdb50732f9863e9104a8ecb77f78d695a266f81511e
font_01_sfnt_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 14564 bytes
SHA-256: f7ea404e107bd9656e378f89c4fcb8814875356f1b3e2a22e674d2c0242116f7
font_02_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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