Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ff97ed6b0a9fb1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 20:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ae27cc6a709fb7258ae1e0bbafa5dc6 SHA-1: 0dcbe0fe9bb5d737e67c3ef6a3b7045c7882f615 SHA-256: 77ff97ed6b0a9fb158f52559db55d01f204bebbca1f2f1ee8e4689505e8a542c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085772009048---luzifuxusuf.pdf In PDF document text
    • https://europartner2.pl/uploads/fevajig.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wiliduvurenosas.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/66682570375.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/xuzavavagabali.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f0b068592f7182c34cf071e9a718e108/5210680984.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/56025568272.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/disejodetu.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/98245510214.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/98276714207.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7392f04ad9e4e88393f55c385ab69e9e.pdfIn PDF document text
    • http://veno2.com/upload/24451749741.pdfIn PDF document text
    • https://digireg.li/upload/galipewenaxubonida.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210831151558.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e70a54947a2e33ee427dcb22933bb561/30325765929.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pm5qd2roo6l3l0mvvfhhe3oqv6/12926501681.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/xupuj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871f5ceade0---wevivez.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kobaram.pdfIn PDF document text
    • https://curvy.tw/upload/files/82226040266.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zubudadatesemetozabera.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/44280614302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chennai+district+map+pdfPDF 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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 10752 bytes
SHA-256: cd54977f24e2d3ff42a942b0b0ad7845cfdd77782903d84b74431b575008c380
font_01_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 18540 bytes
SHA-256: 53d490e661f045bf2147684e28e61bcfa5886223fe3a641d243d931634f569bc