Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b189704a52cdae…

MALICIOUS

PDF

82.1 KB Created: 2021-07-07 06:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07fb65946962058974a4601aca77dca1 SHA-1: 4e2830b76bdc48559e0a8654654915deb8be35cb SHA-256: 49b189704a52cdaea4b40a5ed6902ab328b1a63228de77b20a3ea3f35201b02f
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites, suggesting it's part of a phishing or malware distribution campaign. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to press Win+R or paste a command, a common social engineering tactic to bypass security measures and execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ecohouse-lab.com/userfiles/file/30906380968.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717e41e3dd4---41171308394.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cevjm2gemgvjp21vsqqsrhifd7/riweledawer.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/bekusozin.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/11ofgukg20k279dgbat65st3u6/44515382030.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb68c535bbe---82411299763.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/19240145939.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab66902d9f---82166737898.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hgb88kqletb12m157tgkfo8pt7/48263073448.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/m0ds1gkovhu1hknscioj1ern64/30706960611.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429023249297919.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a77bd3500d2edcdde5ff3e78edaa7597/83102638025.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bikekelegudiraduwopejoke.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094580eaef60---lukedaxunoda.pdfIn PDF document text
    • https://energooptima.hu/upload/File/xozizupopudevemebebite.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/poruzo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2ae8104b21e1736cdffaffc471391ec4/tobav.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/29616956636.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/19636493859.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/2380507968.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/st5pdlv582053o0bia3pd1gqo5/83833808473.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/69f18664e7e9a929e7b69f6298f07442/rowogegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=unable+to+open+pdf+filePDF 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_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 16924 bytes
SHA-256: 429e5cc82035c4e58f08f77bae680e50aeff5d6b84f013da42fa61ac5f565c77
font_01_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 10372 bytes
SHA-256: 73e8969d49838df1a15be48dddbad9efa66329a8c4686c2c0bf2bcf7c221d246

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