Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2e7903dec1b1d2…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 13:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 210ce4f808fd85d40e3c5fbc1ce55dc5 SHA-1: 9515b901db86adea7325dc6ae32b36b547eff7bb SHA-256: 8d2e7903dec1b1d2f258f780fbb8937ff2d89f4376eb4abce9166874cc490ba1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting. The embedded JavaScript and the nature of the links suggest an intent to redirect the user to malicious content, likely for phishing or to download a second-stage payload. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0203e2c755673287d45be20175806790/98820139185.pdf In PDF document text
    • https://bcbc3399.com/upload/files/xetizevekezorakewix.pdfIn PDF document text
    • http://nktrading.qa/file/files/21018821653.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/leruwidunagoxo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/62216131281.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lukanigaxamola.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/68986522844.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0518be7e5---15055456240.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/juwujatuxonixati.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/pitumapomuximuneme.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210804162703.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j0hodisj1q9jvgi7ilsufq0a68/71136480242.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210801_FE2D658491063103.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/36758785591.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1vdoldnkrdkjp2n69kocrl9cub/sukiliropurumek.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/61ae91439de5780f54d3e686675bddc4/45314390283.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/xijunonagij.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/12388560424.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6gkuqp1kn279o8pp2uan5hglr3/10787319498.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a8f636810bd06deac93c4d0cdca899cc/24812602774.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/60392997567.pdfIn PDF document text
    • http://isgsrl.it/images/file/gukolomebasikufej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tammy+hembrow+home+workout+pdf+downloadPDF 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_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 17944 bytes
SHA-256: 985884f202cdbe1ec118e61163a0236ba52c1bc82db8aba895c5c36191e0d4e9
font_01_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 11000 bytes
SHA-256: 4d05993e85617035a6ef3d13e46b7677cab57e5378b027da2766710793739305
font_02_sfnt_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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