Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f939947e3016840…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 11:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ef876b53bd0dc7ab3e492231cc1d80f SHA-1: 1fa5e0670e1529bdd4300ae366542828803b473d SHA-256: 9f939947e3016840c93bc7c818fc70af480a83107d573c71dee8d6197f73a3d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further malicious content or falling victim to phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://tvcsoltau.de/userfiles/file/88099648678.pdf In PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/67648053145.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/murerin.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/34601695584.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jovoliwenulikifokafowipij.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161006689405de---29718893646.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jivigazewakawaf.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/dosebamiges.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf0899dbf---lixofajokunedajoz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce052dd35fdcdb97499b02b92233200b/62865124621.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963f58169f6---92933345210.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/rawir.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fb5a175fa---tevalusedoweteri.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/97316785628.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/fimexajifir.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/71214293966.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aafcf30ec---44167067662.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/tudumofuwizuxijataxuj.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/10578046262.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/nutumegomiwozokimi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/lpq4jo9qu28b6nvamfuhn6iou2/guzemi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/284efc6be62dfd8bf5cf89bf2ec9b00f/fewagatumiporolotuzozega.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/71b02d80645ec76faae5b86e2bc40508/pidiwivojip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bsc+1st+year+maths+textbook+pdfPDF 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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 11196 bytes
SHA-256: 4e44dd9b61113504e5a4d5e84747c2d010ba9ec3e5e3d86dcc4b495b08cb6182
font_01_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 18492 bytes
SHA-256: 81a1be9247000245aa7b1fc1c707a7522a9aee73866b5ef87afca88399e53461
font_02_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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