Malicious PDF — malware analysis report

Static analysis result for SHA-256 90df843e7d08b42d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-27 01:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 088c3c460d6065403f1cb134ebd55380 SHA-1: 93b2290b7044fe803ab159a85639a50cfdcf7d4f SHA-256: 90df843e7d08b42def25e9bf6cfe6b362442b5a20ddf7bddf0e3d74147d4f69f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the presence of these links is sufficient evidence of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allasclub.com/campannas/file/borijugamibowilipumipo.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a2965f5edb468e367762e22ef3a9479/vazosukobupifiposun.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd8a47c5d---2066408521.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/67937364690.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160903494911a9---20162989402.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098749f09eca---bemeredebipedi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc226202a9---bofosixigalisoxoselo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/10693759c1e002f6894a4741f04af8ff/sodonitapiko.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/29603460584.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/4368572172.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/14995972871.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/88484859067.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/81eb1fea5e8901074d1c3adbf04e574d/472100107.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/riletunibori.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e7fc4d5170c3959a85297e03f499ff00/26868670671.pdfIn PDF document text
    • http://bamila.vn/luutru/files/25960325140.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae2acd670---34882601804.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/juxirinedotaxojeze.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64349e605---56305834936.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/tijil.pdfIn PDF document text
    • https://unosms.us/userfiles/file/75009783665.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/volegemufuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+reading+methodsPDF 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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10640 bytes
SHA-256: 2b547b66a3001b144845ef51377de394523175e1938a278c901836e077255923
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 16888 bytes
SHA-256: 5d04c4a4c8845bf26f1c0d95d5c02c095c18aba2f93f28faade5423cf3e2f2c6
font_02_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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