Malicious PDF — malware analysis report

Static analysis result for SHA-256 55581c7d74ba4bde…

MALICIOUS

PDF

84.4 KB Created: 2021-08-08 04:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 987a2df58adfb009ee3b50a47fc1ead9 SHA-1: f9db9e6110ce6c29461e35ed4e57d2a1889edb94 SHA-256: 55581c7d74ba4bdefeafe65fcdd230ca6676a0d8502a8dd6ba9e7f784fe28fa3
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 upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are structured as a link farm to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=snakes+on+a+plane+full+movie+free+online+english PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc8267073---lekaxanuviwador.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b56ff82a879---nowimovojalidewilewa.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b93ea947---6258120511.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zadebodobuvakunanowodelu.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/40331763874.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b6be2bf645f0895ed2ad2add5641d591/voxeviwatagab.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/sejisip.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n58ivgmf0er1g5tq8momg5mjq8/54844993160.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df71c86f079---pujekupobef.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/buvijetakudiga.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d36a631440146569a3a0c65c62b9a014/85592927010.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/69071397213.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/89269755859.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/56007712162.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57ec3e466---jepugediwen.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/94070549527.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wojatesesidamefapofores.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/27eade4e07dee4f1897a9d1265d0d738/32692125353.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0148e1b5---burulojuno.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c429d703---14557491682.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5af07f15a---27842916660.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zejavosinuvuwaroxigox.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 11040 bytes
SHA-256: 3d0bfc8402489169b0efcd53499357cfe25802cc60c3c2611fac2ee70b0058cb
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 16724 bytes
SHA-256: b16a2bdddeedb0c3bd553519faf4e0288b86113d0bfd78ddd69e8269dd194e8e

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