Malicious PDF — malware analysis report

Static analysis result for SHA-256 b907e4e7efa87dc7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 08:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d9bf0e8b3c61e6e6caaf81e28cf2763 SHA-1: 90af6063c36c6aaa8a5da4ae10ab4fdbedd0e093 SHA-256: b907e4e7efa87dc71942856d9efa804f00642a141ad0a0d57cec9fb3a5fc2e94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=free+baby+story+books+pdf PDF link annotation
    • http://mashtalkandil.com/userfiles/file/67826459831.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/7605182196.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d708b992245---jaguganejaz.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612551629ee07---fisapofupep.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/keresafipokitigukor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e1854d86---bewuxevofedupowade.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/20775689906.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/tikesisotepizu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m8qd0bt6vjt041h2v5u0v7qqt5/tuvezupabanekaz.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/95788333567.pdfIn PDF document text
    • http://garderoba.sk/images/_file/77695717236.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/bajimudegonis.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f90efcff7085a93eac4fec7300f4b5fb/17837006154.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d8a673ac---nazolozilug.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/dituvavaf.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7df14eb0e0---7419959165.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bfdadb1ff8b677107d13cd8e06858794/popenejagunulogexezuremiw.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/fukamexazi.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/21285711463.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/rerozukakaxadisewinoxene.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_061429_166.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-10/20210610104209496831.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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 17960 bytes
SHA-256: 0cba661e7b8bea2ee1f69e61a0e85d942998175436ccf1da702bc1f5a5e1adb7
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10572 bytes
SHA-256: 04f6d820b537688516bfcbb9a8b27c65c0c27ed75361722235cb35f098ed6a38

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