Malicious PDF — malware analysis report

Static analysis result for SHA-256 b581dee6e43a866c…

MALICIOUS

PDF

146.8 KB Created: 2021-06-25 22:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85f89f9e07a6564f4baf0e6b395d3a54 SHA-1: a68481402406e41a2b0079a8f81989fd52f3b6bb SHA-256: b581dee6e43a866cfeed23981aef959d2bdd3577e8499384183f7c38f35c1510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used to obscure the true destination, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary purpose appears to be redirecting users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://zwickerfoto.hu/_user/file/62818905400.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c790a0b593---xiwijofes.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5f5b520c---20519511655.pdfIn PDF document text
    • http://charontrade.hu/data/file/80196801795.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078406aeb5c1---rojafinefozifipusu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862183eb784---28734282909.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8be994290---rerumixisemokejositira.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d50a697243700e9b43ae255c31a7082c/fepigakenasizifebenedovik.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c63c1359f---bubifadufezugedamenibepum.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/59763539268.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ef0fdcbc2b2e700ada4b5017b927fb9f/xozakir.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/eea1db92484616151ea4798c6ca8e321/zilapivumujufuparekupa.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7264b8d639---17149168864.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/64387868308.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/03c26b0565727148229b1679f3e23cc3/vamalemovo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d27539fc---14382937980.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/44815987079.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pebelimoko.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c78359681d209e9adb5243ee68ca8fb1/62228105190.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/47163301433.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9ff37a02---dolaz.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/986f27842b7aa96b8928fbc42e5501c5/71083802584.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/99545597163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=he+shall+feed+his+flock+soprano+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_off0001da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F22B 10700 bytes
SHA-256: 1bc0b937b167c2420796e379c207f4dbb35df9205157071d9103826eb335333e
font_02_sfnt_off00020a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A93 19432 bytes
SHA-256: a363079f9ac0fd74fda5dec0a6c185f8014b37c1ff4249dd266954cd21f593ac

Open this report in the interactive analyzer, or submit your own file for analysis.