Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2b363dc2d9e2cd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 12:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7a4ed2492b51b2deecb5141052a8a1e7 SHA-1: 1c8515d73b7df24d19ab598d579730cb0174c040 SHA-256: 2f2b363dc2d9e2cd2f669db06d756254813e970bbce56d6ce264dc2a989ced28
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 0.9974

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://mxm-hosting.nl/img/editor/file/1541443859.pdf In PDF document text
    • http://xsjsbzrw.com/uploads/files/50960221947.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/11054392680.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/78763537583.pdfIn PDF document text
    • http://renknh.com/ckupload/files/vezixaxu.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/90870814132.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/74582295633.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1992bcbe42---dopatigawasewiguwovejixu.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/wikilo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/pigukopokutumixavegufutok.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/jamib.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/kogefapoxagezekavan.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bec3e1c0b---70802423.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210723092719.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d966c803de---zafexufumezisiz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be701cc5dc---tiwegotulita.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/6852968350.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63957b754---zosulaguzujuxuzapujutorix.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/24414965715.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/30413474095.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/98590429232.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/3vt9doinjtru3hur72oq8c53k3/gafej.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/befakibalegizenomibof.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/janovijevodudeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kudankulam+nuclear+power+plant+advantages+and+disadvantages+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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 18948 bytes
SHA-256: 39691c5bdf1816709ddc7325b3ce56f6271dc86b372968e572c60fb3f12d65c0
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 11300 bytes
SHA-256: 19f2ece8a98caf783b7d9833ccd5babc0a13e67447e65dc3c58a60a710335d96
font_02_sfnt_off00012f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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