Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c01526ae8bb5b0…

MALICIOUS

PDF

101.3 KB Created: 2021-08-07 12:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 624f03da14a24e516e80ee214c76b12a SHA-1: a32d5f0e69fc3881cc128ad079a3524c3f7d8e4b SHA-256: 36c01526ae8bb5b0d2876f77e8ba0124cc91275c7aba5b81e70626745bb14a91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. The embedded URLs and link farm heuristics suggest it is part of a phishing or spam campaign designed to distribute malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a downloader or droppper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=subneteo+de+redes+clase+a+ejercicios+resueltos PDF link annotation
    • http://zussobrance.sk/grafika/dokumenty/51182158517.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8en8uqtlqq3jshm167uakb936/48541843553.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7ofokvedd4jj3b90tqi57epic0/pejuganixozugizaku.pdfIn PDF document text
    • http://mobilenmr.com/files/files/sifibit.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b7af7b0ba---34304880800.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb4eacec5---76712779838.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/rupedowasunaremog.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/fawujunuwejigasifekoze.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f6f4b18a19191bda1a853be8ae51e977/nosur.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/bopun.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/lesixuruvo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160824d629e3e3---3770237653.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56911143439.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097814487908---38045148926.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/81732807414.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/59425407784.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3302517a1d4167a4bfd362494c5cba25/gapipume.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/48304780757.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/sanemexafebagetujub.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sijimiwizatejobuwavirugun.pdfIn PDF document text
    • http://veivel.com/userfiles/file/29839355487.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7bvquovhbb16n65itisnguubr5/sukejud.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0312190cabda4f62ae9bfe938f125f58/zifepe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c141be3c---fexir.pdfIn PDF document text
    • 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_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6F 10808 bytes
SHA-256: f0eb3756d2b53855440436a3e986d665d638fbb63ceb4892b55866b7db831c9d
font_02_sfnt_off00015465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15465 19288 bytes
SHA-256: 023dc0b00c5cab048be1cf6503aa1523e9abf28c0c04ed650aea341dcc19758a

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