Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12f26a5f0e850d1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 08:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73c858041d93da06b41f7820ad69b08d SHA-1: 2df3f35de362c3e26fec4fb011f99fd573a40dcd SHA-256: a12f26a5f0e850d18d7bc38d5021cb4bdbb5525abb9eabb9b643d415e596b3e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://palezieux.com/ckfinder/userfiles/files/54066900275.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142feb82395f---dunutigo.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/38460228206.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/mowubapa.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/68928871594.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pinosozavejexeboruzutaf.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/83268591331.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb378d4bb---10211279075.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/42197106445.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77568902169.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210901_092258.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/10448121486.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/45746624265.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/49786664328.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614166c1dd36d---novumazemubetegorabakoji.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/96863276886.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/rerona.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/perokaturediwumewawipo.pdfIn PDF document text
    • http://tiquital.com/documentos/file/63364998814.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425d4683529---zasukazexibidaj.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jetifigaxux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jathi+ratnalu+full+moviePDF 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_off0000ae0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 10468 bytes
SHA-256: 7bb64212703dd5f7c78bd1938e87aecd3d2300b92a801537fa8f0ac1a24fd13f
font_02_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16072 bytes
SHA-256: e659486fac360e1c277fe86aa6fdb17fa1c983ecf03440c62e218d038e7898e0