Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f43868e2d977e4b…

MALICIOUS

PDF

78.9 KB Created: 2021-07-02 17:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d92cec25372fe241a169d8abea1832d SHA-1: 31e2eda87abfe434379dc67c75fb22317ddc9392 SHA-256: 9f43868e2d977e4ba624502c906b20a1aba46c18f8edec240ca8be51e180ce5e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The embedded URLs and the structure of the PDF strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b370f3c5---ledodabekanuvavemida.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/15vn3lvr1mjq2dfnlnjuk41f1b/sepenepad.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/877a9174270a26eb6e0f7546a7a3dc7b/bedogowuderodolufid.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/34640061922.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/54907199815.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/nemubaxolaberobew.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/86287596210.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/60457839511.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/72964672132.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/58961392744.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16070255ad6846---sojerijelakomorepapapo.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106011755.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/46824107032.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/94026020263.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040fc0641b---jusikosiketujodimikus.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bec424e09c1---movakogube.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6dad11ecd8458eea0270e018a72a0be2/52229396482.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3knivfub5ctf8l0kh470l920uu/61562632457.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/63b7a7a3f35f9a7d62e4d2dd6e6b2442/kikix.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91b4901f75---wuzuritasom.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8ca5eb5755bb02b7701085aefb4acdad/59515957213.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bf8be98e4a305436e155fcacbb571283/fodipitutupuxu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gunidegide.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6f519cbaff493dea1dd69e96baba1f31/nirariz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=smackdown+pain+ps2+isoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 2672 bytes
SHA-256: a92ea00f0598fc7762aa3e62808eb200c579efeaba756d8c0fe462664083bf33
font_01_sfnt_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 10672 bytes
SHA-256: 96341eb2ab89390db69edc0a725274e4d1d9d8a573c8b38264b421bca11437ed
font_02_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 17452 bytes
SHA-256: 67d32e16cdb046b10694121bd1022602d58d8767b237c94c4daaa73b9f284bcd
font_03_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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