Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e978ace0dc9fb99…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 01:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aea9d2c8d1b54970e54d457f8bfb82a SHA-1: 25c6b1067feb45465ae438d336bc0e587d778583 SHA-256: 7e978ace0dc9fb997f05d2ffce11ff9fcd288319983ad21e75e494bc3b4ad72b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various websites, including those hosted on compromised CMS platforms, suggesting an attempt to lure users to potentially malicious content or phishing sites. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=do+android+phones+last+longer+than+iphones PDF link annotation
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210909011155.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/89464076131.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/wupusujoxokuwaxosagu.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/nivevenuz.pdfIn PDF document text
    • http://reichspfarrer.sk/file/12776628342.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xojapogubiwabamuta.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/tesugexizewev.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7bb8c2e18814d582443be9790a646ad5/34879342917.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a1ca2398---kojaxanokoxeziwe.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/cd5e0f3b13b1d9cee174aef1d7c148e5/lilawodutezam.pdfIn PDF document text
    • http://sergeybazarov.ru/file/wobanopakexeriwaju.pdfIn PDF document text
    • https://phr4u.com/files/15824825075.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/vamasufepuk.pdfIn PDF document text
    • http://stattus.com/assets/file/7006488632.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/jadepiviwotapimimonanime.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/fakokisarekoxuwulojutone.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rulonupizonuxi.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/13137991427.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/retuparulexasolinizafi.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/futimoxaweze.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/73215738146.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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 10672 bytes
SHA-256: 5c9308ed41909235df3b669ad238602166b7b147b6f55e0f0a22a3512b9890f9
font_02_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 17632 bytes
SHA-256: 492cc2fee185b73e973557825771ecfb3cafb35d5810a1a806a063be8d632375