Malicious PDF — malware analysis report

Static analysis result for SHA-256 817c2b51a36da608…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 04:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7619a824ac9c8f62dd75873bf970a88c SHA-1: f9b95342b95a02531d2621752b765fd2026a2049 SHA-256: 817c2b51a36da608fff8427a95c17a155bb18f0dd1520fef8fb8582c4773c539
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, potentially for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lovesenergy.com/file/37925255283.pdf In PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/mezefosemufesupajikatonop.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/86555361027.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/rukasidawotirukimodox.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d401b061ea3876f045913025ea557db5/85984698869.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/piwegupudigeb.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/nesuvegaragonida.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/govigotufibomujuramoza.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/93987802612.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbc09185c---vapoxaliliwofavodomaf.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/73536330536.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/60862335874.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/45215338267.pdfIn PDF document text
    • http://babamoleskine.com/files/file/36075872680.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/noranatafikofifemat.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e942fd027f7002f36cc3e7f21155eab1/jagix.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/86439104390.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/32268418776.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/refosuvegegexowuwepov.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_125652.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7a3d9c30e6ac58296a5ce60befd89e2f/nokigudevimobabewa.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/rinesevepaxuxanofadojer.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/47816558203.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zovowevenaninemotode.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7ba216b438aeeaaf2474719b82fdc334/gizumumigekawanidoxelejuv.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/34335283253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+asur+free+on+telegramPDF 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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 17652 bytes
SHA-256: c043a75d2f8feb21a7d0b3f4e276f9bb9728fb76fd1355a36ed8b2f49ab009a7
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 10784 bytes
SHA-256: 070375990ad0ec732cbd2d500d0d4d442d7be3a677df478c62bab7bf95119e9e
font_02_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1