Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d7e30260cfd1a4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 04:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc0d57d8cbce9e20312a20e7b78866dd SHA-1: 37866b03390decf4f341a730869e622618743f1c SHA-256: 39d7e30260cfd1a4eb184c6b2a5b5f8e3be1312704cd5f094899b8e788d112ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves tricking users into clicking these links, which could lead to credential theft or second-stage infections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://fitviewer.de/files/file/kejetid.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f6e863d7---4084555637.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/81016197708.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d0a815adae872adb223486bfec1927ab/nonewadeve.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/pobulenujoro.pdfIn PDF document text
    • https://mmszke.hu/files/file/16655090640.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fd12b7b5---14038013102.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/memilizutin.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/142c22cba0fbc9cac4d8905c5659a2f1/xozalolapofegokofi.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/99315847905.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mekus.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bafenanogodevalaluvu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607401a18e36f---94311882953.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/j5r7k5hbe5lfuae3fqml3c09co/xezuzisevimubulu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/58347235540.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab811acc5bf---fazugar.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jiviberironamufuzezado.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/81389530969.pdfIn PDF document text
    • http://cecev.com/stockages/files/41712648757.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/3513762495.pdfIn PDF document text
    • http://gabortech.com/admin/file/29282241498.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/88952184680.pdfIn PDF document text
    • https://amblamy.ee/upload/file/lilefivon.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/31cb570b484b30a5b909869c62655815/tiwonikakavuwezepan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=binomial+probability+worksheet+2+answersPDF 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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 11124 bytes
SHA-256: ed68078cf1fa368c6d20228656a72069d3dda535b9bd8cb028474de929a769e5
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 18368 bytes
SHA-256: ff77c7eef6d2c83166d6792e6f9a69c12a097ed3b3a13e85aec48895e0bf95d8

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