Malicious PDF — malware analysis report

Static analysis result for SHA-256 705d804c11192671…

MALICIOUS

PDF

110.7 KB Created: 2021-09-07 20:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a51b7eb50526e848a2c62ee4f833530 SHA-1: d71c39a9c4530eb70f2f670ddf5d3516c6173528 SHA-256: 705d804c111926710e0cadd59625a5f48d4605e4d14068daac2fff4ed4cc47f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://aronabritcan.com/userfiles/file/94190300914.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-1/20210701150727828575.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/24172720244.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/nagit.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/vedagunaruluw.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf2aa11f77e98f34d6c548ee0205bb3e/92455603656.pdfIn PDF document text
    • http://hasyo.net/files/file/364015967.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c48ea51e82---xakimapowuxozerun.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mso67snpvvj60lb0cgrg22r2lk/95528506143.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bff2ed69a---93592246795.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/duxuj.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/malalo.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/70005415578.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/tozavularujumiwesiji.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/22bg5loae5mb6casa07o9bevm1/99075165177.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210809064402206.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c99e0d31f---36311742056.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/09a5b53f0bbb88894e0d9bcc64eb5eb9/wavasamisez.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66b072ab0---90894766180.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tobevutubabebupixe.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/31659506955.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/85817310710.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/50882187153.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/94143470482.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/28429261687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=relationship+between+incidence+and+prevalence+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_off000143a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 20748 bytes
SHA-256: df27002b0b0f1a98e0580c50153afd4942971c804d2e178283f5fc8fd64debda
font_01_sfnt_off00017adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ADB 11056 bytes
SHA-256: 78f7f6303dd472a0e65d919fa5aacb76f19fdf6f70dc9bea49d1bf2d8d911170
font_02_sfnt_off0001945f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1945F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1