Malicious PDF — malware analysis report

Static analysis result for SHA-256 82637a1003853609…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 21:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ae828d88fc081d248f01408b029ce46 SHA-1: 1cb048d2b71def364f4b71ef013aeee33d43ec2c SHA-256: 82637a1003853609010493d47ba6b36e2ae927a2654b403680d5b92131f65982
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded JS and external links indicates it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://colafranceschi.it/userfiles/files/20978212736.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc18a12a1c---50659874780.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9a4da3567---9101609755.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/getozazexapofiviniwofel.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/tifaga.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/24777697436.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/44990077809.pdfIn macro / runtime command snippet
    • http://kajsanordstrom.com/userfiles/files/9901704509.pdfIn macro / runtime command snippet
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d499778199de6ba87dd3eadb63ab4760/98519544785.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/komonaweguduxi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/lekowuvurugamewazeki.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/33274016536.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/851e14812971ab44d74e955e390f7fbf/xepeloxemunezi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/rexibifokegosurasunibaliv.pdfIn PDF document text
    • http://dakmet.pl/upload/19469663636.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/92628841749.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/70159076028.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b76cbd41a---wizakenatuvosefemukipoti.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d88499444---31503836876.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/jojowifimaluxagunoxo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9c98138255ec1f39867d3c91fa6a097b/xizakepowisibeniworum.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7839387925---penigapazefuvabajinibaven.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8c9e20cf---12715461364.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/debivuletaxiruramamu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608389667a802---gatoxogo.pdfIn PDF document text
    • http://benthanhsgfarm.net/imIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=scientific+notation+anchor+chart+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 17832 bytes
SHA-256: 4314ea9d459825894e0ed284e314aeea72020c0a858b3cd7733ece0c5b63ff19
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10576 bytes
SHA-256: 71818115124f1c5f5884ca01ac7ee1240d9f3acc6593ebb709943044bfbe1acd

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