Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bf00f658a199a3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 19:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd22734a89b777aaff9ba874e35897f9 SHA-1: 7097fcf5674ed6b118e02953316e96961ece82a3 SHA-256: 88bf00f658a199a355c06e7994e8278f128413295a0cf2c4f4a561b033052249
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on disposable domains or compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary lure appears to be disguised search results for free game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://garglob.ru/uplcv?utm_term=psp+games+under+100mb+free+download+romsmania PDF link annotation
    • http://artikos.pl/userfiles/file/rapefapinibunuzijigasu.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/88263183933.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/81858374598.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-09/images/files/gamiviteretunagu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161439f77c32ff---jituzitevizew.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/41710848184.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/pufuvumot.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f84d749819bcf9d53ee91dbc6c43e058/leritugasalagobuwex.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/sixamofudumenadujomoju.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/pexiwipujataxadomexup.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/81462686976.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zilivekisi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/reretofesafudinakejosotu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614aec9d12c11---penebopegujerenawum.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8890ea4e1d16d8b37a1a0929b3f0d86b/55690027467.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/balowimugikatesiz.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/4466853693.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/69870472647.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/74832041698.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/35871470967.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181245138236.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/sugafiwe.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/badijamasenaxakaza.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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 15976 bytes
SHA-256: 2e40a40ea0630670c6aaf4117a54ac5b954a52b61ceb74c41b398ec9614292f7
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11244 bytes
SHA-256: b8a6ba2a1ed3739b5ca23f5f6ce27612ecb39d797b12f609d499a9a587ba1f30