Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de329dacd3f6b9e…

MALICIOUS

PDF

133.2 KB Created: 2021-07-13 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aaac645c61a6bc4f82cb3b48b0ae545a SHA-1: 70ebd7e93169a2266a3b4d087fe1cd6ae689510e SHA-256: 1de329dacd3f6b9e92f9f9d0a0629aea561177459b7a80ca94e766d7778be32c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k9of8ciekgbtql80lvrki4c9h2/44306220843.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb701fb2b---78719761933.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7hjut3ectclnepth69nk10lh40/mixurifadekijo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1aa679437---21054496850.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/vokemupabujibasobupaxukob.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f945018973---fokomoraresobuzizori.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/rulizaru.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b8c25c11---tixeza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f223341a8b---65558304577.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nazidisebobumu.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/rixunirowedanedaputaxogol.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/80433959123.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/81d388d09244a23ae1ac37b4e67f5100/84204328908.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f863f6167c---baxemok.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/39156038837.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b21c821f07fb9956f6a1c380bebde2f7/rokijijugaguf.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dde85413f---77454684872.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ce6k0h5btc2gk3i3j6fpob95sf/99159493202.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/26055403778.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91871f129---wafilizidakonujapida.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fea9e199d---kobega.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/megeru.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a732c8699d---21246702504.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/757753c248a0404e58de4c1d00271f70/19504383954.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e013b6d92e---8238952059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=principles+of+pulse+electron+paramagnetic+resonancePDF 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_off0001a27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A27A 10924 bytes
SHA-256: d7a951a67a4f6bbe415160d99f0d37f4ee90a1bcc2b89acad66be693883432c0
font_01_sfnt_off0001bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBC5 19688 bytes
SHA-256: f9eb4b7455030996008702f848ff19ec2816ab755d1b652c917db5892ca27f9b
font_02_sfnt_off0001eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1