Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f1c4d1e7ae26d3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 20:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a36e0ad9c7c22ddcf6aee61fa7de087a SHA-1: e9bf5f74ae89a59e3c4cb7fee710a00b582cb61f SHA-256: 98f1c4d1e7ae26d352d4723f556a92c7d92c5fe897511aaec66f81aae8c3e6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack vector appears to be luring the user to download a secondary payload disguised as a legitimate file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://anjilh.com/uploadfile/file///2021042915234076.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0gk4fviclc9bq3jr2cfo5305n3/kovot.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/xunal.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749735af66a---fodurenepelego.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba30c0a6f0---zimotokebapobekafofuteb.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6cd60aaa---25000067709.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607776795f253---67458160553.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a9f37d619cff7dcb0908401a80b8ca9/sobonobutok.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ithul4kn72shblv1ra7q59aulm/72922045371.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fbfab2979c641b8896e68c29ba078489/sabokinuzaxapejomamezosew.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/5343993319.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/lotiwugudunimin.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f31ouo2b2aig7m6fr9f026b260/zuzib.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/lidusemux.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgaucvp31vef4cj6k61ac04bqp/16108281693.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/fc03e220c49bap4dlrf1gfps14/fuzigufekuwusofegujop.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815aba7cb4---87883635354.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/42664545439.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/46954533218.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/97272813728.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4e93dfa7095785dd264bd772fead943c/pebogifesupax.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/sezutunesawuguvevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=school+calendar+2018+pdfPDF 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 17720 bytes
SHA-256: 43e77c582c5f9ef454560033c1a1ecac2ed03374c0e2a470d94bfab44088485d
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10936 bytes
SHA-256: c28975e164e9b3591bbcdeb1b14b16b395946d868259e53359b091473a6c8392
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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