Malicious PDF — malware analysis report

Static analysis result for SHA-256 798f323467a9c976…

MALICIOUS

PDF

90.2 KB Created: 2021-07-29 23:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfc54bbd8ba6767fd14ac6481a4f61cb SHA-1: 9c5fed7c857e64bb97e908c50cc07326de79aca9 SHA-256: 798f323467a9c9760dc3481545974563018976e20f11af4c02f7c4208a074e9c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the presence of multiple external links and the overall structure align with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/40107199234ab3a33359e0b90a4f551b/83773302300.pdf
    • http://xycrusher.com/d/files/30386508135.pdf
    • http://www.lugashotel.com/data/editorfile/71379486548.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9819303761ad90680368a0e08e49c093/lifinopisatoxisika.pdf
    • http://studiodrago.eu/userfiles/files/rapapagivaxuxidonizolibo.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ca924fe44d870219d57561995c043a4e/dibewipofed.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3ad74c988---misurejelezorolom.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n2j0crqp353fn20do56bfh2vgh/luwofaf.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f1231a603f2c77e5c6ec51199f2df674/zakereraxafakubawod.pdf
    • http://cnpair.com/userfiles/file/87972701660.pdf
    • http://generale-bureautique.fr/gdb/files/file/26002003826.pdf
    • http://radio6deenero.com/uploaded/files/bivadenapamojixit.pdf
    • http://chatfieldfarms101.com/userimages/54967348268.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adac4117c3e---18903481302.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607230b4e113c---rufepapumi.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088908e77482---86152573467.pdf
    • http://3dprofi.net/images/uploads/file/31169119245.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf68d706b---7634101720.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/70525415666.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbeace6958---5383270218.pdf
    • http://musorcentrum.hu/files/article/file/vexug.pdf
    • http://bajajsports.com/userfiles/file/pidaxonodopor.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098d2c6555e6---pidagizizafuxemesedabobuk.pdf
    • http://sisparts.pl/zdjecia/fck/file/mefiwufijijegakisugo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+measure+ring+size+at+home
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 16792 bytes
font_01_sfnt_off0001150d.bin
89fe2661b8e727c07bc2b2a81e57dfc62480ddb7ec065478fe78ed28d4621b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 17236 bytes
font_02_sfnt_off00014222.bin
78e4f138b15bad490e14a505529cb0157cb13306c2ec778df678969859544827
pdf-font-stream PDF embedded font (sfnt) at offset 0x14222 10744 bytes