Malicious PDF — malware analysis report

Static analysis result for SHA-256 88253b1b3122de62…

MALICIOUS

PDF

81.8 KB Created: 2021-08-18 22:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 088a3e399cf5fd68d7d4dff7f742121a SHA-1: 7e2b54e04fecdaf9859d27619e90d1ca9b322017 SHA-256: 88253b1b3122de62706bdf9f0d4a7fe56c37a6e35c728f17c1e8d6ef66a0b5ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=phone+call+female+voice+changer+app PDF link annotation
    • http://akinmedical.com/uploads/file/solapezadak.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1159b6bf5---waridegebeguri.pdfIn PDF document text
    • http://iccarrentals.com/files/file/sepenukagu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160778f263a560---lalok.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5ml2l3ipnbb5c6hgigoq04lvj7/jamiligojare.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/77843024905.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/kedufitogi.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/6793592416.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bedepixakugepunitubupigo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cba8268a45edfbc1edf1474dedbba96a/23830452328.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/68131874914.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db7ff0af1e4---95686695904.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepajadasesufiluvebula.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/61613067120.pdfIn PDF document text
    • http://poorclarescork.ie/images/zexufidobejuxemit.pdfIn PDF document text
    • https://beliangka.com/contents//files/fakexanejexuwazojadelujep.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/raxag.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/44870719136.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/gowefewutobakubobe.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/no69i4mvl6h9gup8p6f1f63jiu/23213229778.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/78215806454.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/37d7ca25ca23899b6c226b9434d412f1/11438734604.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a778423bcd---53454214546.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tdhcs3s98tuukfh53vouicng71/61427935766.pdfIn PDF document text
    • 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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 17376 bytes
SHA-256: 8b64777db7553355b6b5a2ddf42e1d9155bea32fea595a0c71e506a25e9062f8
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 10728 bytes
SHA-256: 4e0c113b1a0701abf423512504d79bc18ec68368bb36060d5852363907ea2adc

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