Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d643e336bcbd6d…

MALICIOUS

PDF

86.0 KB Created: 2021-08-27 15:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d53458998136daf5a4da8b6372c3e8a SHA-1: 7ccebef8aedbd7512f973d6bd3a8af89efd4c5f0 SHA-256: 57d643e336bcbd6de13b09c11b04e7cdc7a98105d1e314f8c94898b1a59a642c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of a link farm on potentially compromised CMS upload directories further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c152ea7e8---60349566454.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/61898633680.pdfIn PDF document text
    • https://istanajp2.com/contents/files/fokizoremi.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210826182136127.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/53926803722.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/71926828810.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aa6676bb2---mogugibujokobowonokof.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/77694868454.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/20662787716.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160933cf8f2295---jatejijekoluroper.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e7d12379---71893898277.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/fiwurevemejupu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kipavener.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/buzosezusupofoxexuvulur.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1c51e6e494807f41f9bd6396b7d1fbaf/48823384189.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608241270af6e---34002077458.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/laduzukaxonuj.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/ririxevoroferijitu.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/87621534634.pdfPDF link annotation
    • http://paillasse.hu/userfiles/file/pamapisojabikek.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/98593402916.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6a21541a93a1e37dbcc09afb7c9af6f7/54813964134.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f351793723a---63156485198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=campus+tour+guide+interview+questionsPDF 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_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 11116 bytes
SHA-256: 05055ea528dc5beb14123ff7e05bc3a5c0aeacfddcbaa75d1dbb6dcf40b74753
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 17500 bytes
SHA-256: 44baf1d5e893750ae57237e3f4e61d67863f32819adf8e9609853eeb7ba2a447

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