Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8838576d6e6d8b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-16 04:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33cc9b8f66af3d0897e77c5574bb2c39 SHA-1: d1abf1158dcce4e84d8491e24a7fd1a5d3350aa9 SHA-256: 5a8838576d6e6d8be2b46208e3843a2ee56cb7f78a739dcc9e8f34967e793430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

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://catamma.ru/uplcv?utm_term=merge+animal+kingdom PDF link annotation
    • http://aytekinpolatel.com/image/files/wajatiposuboduwizud.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/84994517677.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bffb1df84---28333994202.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/50200213429.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/81707119309.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/poxud.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xapukimetaxuli.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/gapusifod.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/27804239949.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/verumejufeb.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/ripizuzulizi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9c3a87f1e266880d12f63260fa1854b/66509461279.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/53317892592.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/6528003093.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/sininomedolite.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/tibemufifudusivusom.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/luroge.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/1126009148.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1140118787cf99fa3665ce4a29bd742e/roxiwunejijozub.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe7d91a05---kuxasivizunabaxijapofuro.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/4955101016.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/87782618847.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35cee32e1---34576470904.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_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 18204 bytes
SHA-256: 6bf91d51a012a5f7cd96dc9b433ce0613de27c1c0b193a5ba8799e89f2676969
font_01_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 10412 bytes
SHA-256: 369445aedb41aabf27da21faaa8025778e4e65c0c92156f4b6b4ad7b229c8c5d
font_02_sfnt_off00014516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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