Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbb45b6a816466e…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 11:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e30b5c1bc2cd4e50e069193cf3a2404 SHA-1: 5b0051764d7b9632ba31fb1899fbd9485f536c28 SHA-256: edbb45b6a816466e6686f514a8a6551261fa2d12866520fef3ecad9eeab50d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to redirect users to untrusted external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294c3353e1c---sewizopijob.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tu5f2bhueofge4hi2rrd1bf551/kusibogabezusasisebavi.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/63552365667.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nib4arfm8dn2afbi3mh3n3qb20/66785157272.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/najapapawas.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/81329064756.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3lnvt3f0mugdr56r9c17unlh1i/xixinanazunuzana.pdfIn PDF document text
    • http://travellerisland.com/files/3378312313.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/46576161508.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ae2523635aa---kirofurekir.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6fc7c5adc---zadebateraxerolotata.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r7d5i2qre3c4e561ons8scnuqt/30291687149.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb754582c0---68872584948.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/duwerowo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612158670dccb---suzox.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/93844830493.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074627439934---27411788888.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/banojuzezobufumasamu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef13efe2c---lidaxew.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19637d66e---bimabotupoba.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/74848877425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=iphone+configuration+utility+for+macPDF 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_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 19164 bytes
SHA-256: dc8e7df3553864a62b155dad7a6291df81c679faffae5ca98d9bab4f6335b965
font_01_sfnt_off00014057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001586e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586E 10924 bytes
SHA-256: d43ea3f5ddbf8816e0b3c47edf7ae7c072649702c363543feb28c4ad7e1c1fdd

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