Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf70ddf35d125c9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9fc8ee188f1174c3cfdba6c1b0cd6b2c SHA-1: 2da1f5ecee60eeb15df99fd918698a71d53e6d41 SHA-256: dcf70ddf35d125c9434d35c85687ec6f74e06c45a90b46628cff79f38ff11af0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of numerous embedded URLs, many pointing to WordPress plugin upload directories, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614827f2afe2a---mukuvuwur.pdf In PDF document text
    • http://sydjpg.com/images/upload/file/20210909_205711_124.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/vaveloxoresudoveluda.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614069bdaf872---25891643815.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/15399611813.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/gewajebufelugak.pdfIn PDF document text
    • http://perksys.com/userfiles/file/tutofarovuvuju.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pofefulupoduzobogaxas.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tizolikipemokulaxatuba.pdfIn PDF document text
    • http://wohingltd.com/userfiles/gefiledasejevasamituw.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/valikaxebusuwunasagedep.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614032902b3d6---93522531827.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zeragakupudowizi.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/wopubijevanozajazaxidifo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/e5f1dghq3q80l11mec1lmbqtvd/83593222841.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zuvodavorixugavu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/48f3f728325d9a1e3c9b8560606b7405/jopatuguzixawurejake.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/11982954434.pdfIn PDF document text
    • http://cx-gl.hu/images/files/fufudomuf.pdfIn PDF document text
    • http://tzsunup.com/upload/34994077825.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/17378267218.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/sutorozuvawezejozanumeso.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/77649678470.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/fuwisi.pdfIn PDF document text
    • https://norservis.com/files/files/20801554668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=car+simulator+3d+mod+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10712 bytes
SHA-256: 52c57a0c682d11dad63899eeaaf2e62376a86fb372b4d6995957e34faf3706c3
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 17612 bytes
SHA-256: 458aedb48aa57fedc175aa8231c2a61f70ad58fb1efac31e1660e087db857eee

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