Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1c2bb2ae64118d…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 20:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a6d5fc197f56750272ac385fd89c142 SHA-1: 4ce3f4b1322d46ced651e6f533ea94eb01752fc6 SHA-256: 9d1c2bb2ae64118dd54e4bc8d5c7794798d822ec9fe510ae25fba2018fdc3e9f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2df1180221e9d9120cb72ccbb7470107/kalavutumapadiravegimagaw.pdf In PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/47276258671.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab249fb5402---misisunuzusutiwumono.pdfIn PDF document text
    • http://vhktn.at/images/content/files/muziv.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff159ce9b---zonagonujebo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bue7e28q67rukefj211k3sn5t2/63481006587.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/rixaluwixuzepodunu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddac7f1275---dufadidusizonuku.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/7776def67ab7ebee4e01683b9659af32/89991199586.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dfa308b56---kelesit.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/18667508809.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32850d0bcb---26352750665.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/buwuzabexafevojimiwogad.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pojilumupinidor.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6200d35e037a9b119e7c43b89f580fa3/xovapolesikol.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609573bcf3981---kulezesavup.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/a3d9eabe69f7d5c1e4bbb6b4b00ab084/dakexudori.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4688a4c9f87381ea13e3e0554c578345/11993450445.pdfIn PDF document text
    • http://sukhabalka.com/files/file/zarabotuvitemufezo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ffca16fd---mipudabenekaxozinerejexa.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d40c5ebe924---24324136868.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/xidujuvojonuvimipopixow.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/90205860112.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74c476ae4---13063738784.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/doxenatavenaxilem.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3e0befa62---80685195995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=overpopulation+and+environmentPDF 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_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 17208 bytes
SHA-256: e2b9839f7d26445d2a7b258900e3610bdfcae59a5a731289d38d1933224d70fd
font_02_sfnt_off00015b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B60 10576 bytes
SHA-256: 97beb793c94dfc55ed8072db91dac692161caf76d9d68541800a80e853c79c87

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