Malicious PDF — malware analysis report

Static analysis result for SHA-256 1819e5f2a1060b26…

MALICIOUS

PDF

87.4 KB Created: 2021-08-02 02:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e71e302f8216f9d5fc07ebdb51cff0e2 SHA-1: f0b38845a0727fd72d4995841ab4ca0b3efe7541 SHA-256: 1819e5f2a1060b260c55e347a23b9f02d080962505b962b9508f50871b7c2300
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the phishing or malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4361

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=rentrer+verb+french+conjugation+practice PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608924d94d64e---vuvefapegowevureforu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d2873ed1---fivarixuj.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ac1197e03fe3206267bea1a8c5007486/13158515057.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984e707d297---8496160704.pdfIn PDF document text
    • https://mollis.rs//files/3496727729.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9ffdc7215aedaee030a51bce9263b24c/32506220622.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85022424220.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/67285064848.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f296d868e8bcb8b9c6a4c175adb0817/82219335887.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/48080089090.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8391c44c1d---18476030588.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/raregatixidixuwujaziwuf.pdfIn PDF document text
    • https://atrax.hr/files/88993557029.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/39455613631.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799114cf924---63280084216.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/41919745546.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d9449104---85158565754.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/95601014584.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c216cfa62d5---fuzebekiwasikanol.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9ff1f755196d3d01c3c74b096f996cb4/7580268051.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/sanulopabekexokoba.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0292f275---kabetunodiganejuduxo.pdfIn 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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 18984 bytes
SHA-256: d9e0c8487f0f8e968db66c9799619807acbe7d54138a2312267531c356edb046
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 17160 bytes
SHA-256: 0031c3c2ba3b90d97080a977e9401a565477d1436ef4c4b456ff0784fff818bd