Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb664e4af1a216ef…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 22:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4dfe890ebfc114699197e892f79b19bd SHA-1: 64cf4cca48998b96011ad6fa194f5f02168fe61c SHA-256: bb664e4af1a216efcd2a288e26119f4a7fba8c9b459789581311be54c2810509
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911cab1fb44---nelex.pdf In PDF document text
    • https://htchninc.com/d/files/87549774186.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2fd6f2dc---mikubepefo.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/wuzulorugexosovijowup.pdfIn PDF document text
    • http://mesterek.net/tmp/fowijibikariti.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/laxijebusunajo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744616c3ca7---mamuxizidedeximubofuta.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c4d292dc---suramevuzuwojuji.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s7r3nugrms8ptd97gc37d2njdk/mufibavo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/zuludovag.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/kujuxoxevafik.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088deaabb3bd---kisugapusik.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965707f0a0d---fagizij.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3suthpqide8c9b5ibjflkd4m46/57356462463.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/13035369051.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/8362506181.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5d75c599b---635876080.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/pivijekefu.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/napesirugixovepubefizemut.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/835ja3mcsf0scje2dcl67pfrt3/63646651164.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0287613c23---34600692225.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wotuzulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=career+counselling+near+me+freePDF 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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 16620 bytes
SHA-256: f4e67da3756f5d4ffe68edbc56990f50cea1d4b2eb6d7f76ca2aab86d781138e
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 10712 bytes
SHA-256: a414fd438fbd9afbcca2a89e99b500b2a7e5fcbdf5faf16081493a7ce9c9c9da
font_02_sfnt_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1