Malicious PDF — malware analysis report

Static analysis result for SHA-256 2187889daeaad097…

MALICIOUS

PDF

95.2 KB Created: 2021-07-29 20:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9988adb8a689dc78226846282cd457d SHA-1: aac996e1e8ab1cb64877cef1cf40abeff4df182b SHA-256: 2187889daeaad097ff745abdc2d91d779a3a2bd8bcc21e6c52751ea554c20f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=marriage+biodata+template+word PDF link annotation
    • http://domholidays.com/userfiles/file/ridajumalufad.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/21753247096.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0qc0ofd70laki08hlan9nsik9t/77717595550.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2ab644f3---41298947280.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e3e38c7bf6841a3c26241d0a0239096c/lekiwigagigaxanipojuzit.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c652fa2b---4310846392.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/powir.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb274c471d---gokiluwezixip.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ede1056b3cb365f15921a84979ada654/wagoda.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/74732830078.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/59313713252.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5lbqo6hc3dg8qaaikcsbbiptv8/71142372533.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/noguxugalunuj.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f3a5ee5b1---kowanejeruwaguxunonegu.pdfIn PDF document text
    • https://stvorki.ru/files/file/92267942736.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cea9d0c70d4ca0238c6e16c5d1925b1/26357175408.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/50595879074.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b456750af9c---92937306429.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/36eb654f0b522040532d19ba7f1eead0/jizoxuzarif.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10c67b578---saxafaxumevezexi.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/051426529076.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/vameguju.pdfIn PDF document text
    • http://yuha.be/_files/file/jiwawebosowaziliwal.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_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16976 bytes
SHA-256: 162f391aef6c71f5ec4172e263dcc35ac41167ff4758212b5e22b60cfb5c0dc7
font_01_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 10684 bytes
SHA-256: 785b1e84c59bfe4276b6aeb54a2f79c41a66d398d7fe652932cf851a589aaa29

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