Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bbf3902275b032…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 03:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d74ad57ada1e32c8c8ecaac3a6973c32 SHA-1: 803790c9ec5e52970ea4185b8bd1e274608fe8bb SHA-256: a1bbf3902275b03261a1811b7b166877787f9be16b2fd1878c141bb18d6151c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quocteanviet.com/img-chamthi/files/xuzufefalebutolupedita.pdf In PDF document text
    • http://letdentalab.com/img/files/kejiwagewija.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/xaledegotug.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/jojebonokovet.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a155bb10060---jojinarazunepexumudixex.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749f5693c3b---20165962201.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9413781399099d7ad788d5e662e0efa0/ziwumafo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/klbqrkeoijffu3llbsl5p3tob3/demirevosagen.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573df40f32---32649327325.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f3db5d9b9---dozepiwiwuvixafuzolemes.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/68573605872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6244ae4f17---gevizimasojewowa.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/zinilesosofitof.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4ba9b56c---totadivujawagoxalofavin.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/18990822832.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/00r4gbcboce1c34u251m1bdkrq/kogozegu.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/80717429538.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/nufikizojo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/womunemibegaramiru.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/weporegibatime.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/bosurorunopiv.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kefotizinosu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ac86rn2n0efpcibqdpjb8qijq6/vudezuroxubot.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/36820205690.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829b22a5145---rezuvegevasap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=class+11+physics+important+chaptersPDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10836 bytes
SHA-256: 382373732201157c65d2cb9b7b728e88893caf17022a7c7baaaa77ae5c282719
font_02_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 17476 bytes
SHA-256: 573ef24daa9994f106344bc0ec2274bd56ac7cc2a205ebfc37f56ac8e7a7fa54

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