Malicious PDF — malware analysis report

Static analysis result for SHA-256 873365d401d77b41…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 19:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 223bb5b34b1d083bff91c3295c4aa4fe SHA-1: 8b2b12861785b6813b81dd85b3eeeee1c29f3f51 SHA-256: 873365d401d77b4167f5fbbffefe9731633a7fb2b9934e887360d241cc2bbad5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aksaaydinlatma.com/img/editor/image/file/30826908925.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d1e8c1c4db7af8b028c6c72d58b40296/68236685791.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/doxuzarawelarexefozet.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/706s40001gmeqc05g9m0d573q1/69797422194.pdfIn PDF document text
    • https://digireg.org/upload/34233089136.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/monaxuzevadaza.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde5f4a958---kupugokitag.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3093c93ab6f221268fdb48a888ae41a7/liruwegunirogukoxuju.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/safenarobewud.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/6584605471.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/007ba22c27eca2dad06f92ca57ac6fdc/kuxanexilawulufixov.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/torojegifufawusar.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dan7f91dg2b7o806bp9u4lrsdp/kikerixudixuluxi.pdfIn PDF document text
    • http://runo34.ru/attachments/file/48550767573.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rekot.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/jo76unj6lp5nl4131hvl9hh3aj/27659405629.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wawovukubenof.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/jowatodogevokagopefuloz.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/m43q8ccttlllmbmlite5q1kop5/35440947197.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/54199421401.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/degabemaxuxapexujolofera.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b103d214---55912071464.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/41829153523.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/gemezorudafig.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1002bc49fb752d46136a83ca91416d56/pogumezinurafemofilow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=codigo+de+procedimiento+civil+chile+2018+pdfPDF link annotation
    • 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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 19592 bytes
SHA-256: 5e1df6f7748425a148a3dd02dd956c2d2d294e91e669dd34423d1a85a2ccf58d
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 11336 bytes
SHA-256: 0ab2d285d7deae6d74770e6566d9e0295b316484abfb419ebcf080d13e51f742
font_02_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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