Malicious PDF — malware analysis report

Static analysis result for SHA-256 330b33b6528abfc7…

MALICIOUS

PDF

84.7 KB Created: 2021-07-30 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 51f9ff6dfbaa3c465ecddc2a0866c9dd SHA-1: 73ea3d5b6452399c184d6a7c710f5decf6a145f8 SHA-256: 330b33b6528abfc7c08e0ef1a3b7e7e62a177a9bdf7769e604cc01943d1f3e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://amblamy.ee/upload/file/59979058875.pdf In PDF document text
    • http://forglass.sk/userfiles/file/batanegibexipek.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/he4i4pt5qcf0lain7fnfdk1ct2/42312957031.pdfIn PDF document text
    • https://bamor.org/userfiles/file/mofubozituzalujopapod.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6a42dd16c686c2acf50f5aef7256681e/1253540672.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621075673.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/42409108664.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622506552.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094164e4e242---latupomedobes.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/tijisejojobefibisifaw.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a3545e673004fdf490502c78c528ca75/27568374221.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621111434.pdfIn PDF document text
    • https://ahha.az/userfiles/file/48798433413.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/af5c5669d403497a3b0a674deb469d9a/44543478118.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/82ths6k7bem8qcav86db4nf9p6/lupowamuvi.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/af7931622863a2ec8c6b164fdc1d294a/nesipe.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/93964118393.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/19238842687.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d051bf1699---baderinebobogugofopufon.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/93016221304.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/jowudifomotubafogasob.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804b5b8e1ae---20468457996.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e19b59118---vimiviv.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lfin6ps4vjll03u8n4uu12e964/59133918413.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/31043762898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=10.s%C4%B1n%C4%B1f+co%C4%9Frafya+1.%C3%BCnite+konu+%C3%B6zeti+2020PDF 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 11600 bytes
SHA-256: 50a7a1a7b9247ec739f52425c29ce3d85b1ca6b1d0dc285e2215d74b53ae2443
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 18540 bytes
SHA-256: 84c95e015fbdbb53928d463460a326466667f76e9ee7e41b55bdc0e097f52014
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1