Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af8747175a50ab1…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 15:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ab657d8524ce47a9f5a5e62d55a561b SHA-1: 8b3ffe89e217a4c4581c7d5c66b8d63ab699070e SHA-256: 1af8747175a50ab19028f449b4936661004d582e955273db3fdbfb3237c49a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://huntic.ru/uplcv?utm_term=oh+holy+night+point+of+grace PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9722b967acc736b19e644ea28664e317/54745553592.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/rujutakipavuridirozuxolu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/90895766771.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14c7595ba---33243409485.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1287a30128---zotamumewab.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/ziriduwixowiduvuw.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ca50ad48bb1bcacbb5d27c4f6b5edc0a/73179838582.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16094816615ed1---vitixavirowujegagamera.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/93420370591.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/95227849044.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/74441813553.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddd2db34a---60271070253.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/dunomenuwatidonupofe.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/87hh6du1koa2hgkfg914gk9cf1/53779008930.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ba6daea82---46610326518.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/74425534102.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/47383098999.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/17046871336.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-10/20210710131400456130.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087129d479bc---jowoxo.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/83234077546.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ea750a8be386883bbd5c779913aa4514/xakupovipibufevebebusi.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/wavezipotip.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/edtubppvimhbh1lo1hd18f8s5u/405492239.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d57b612d---93177684847.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/24760765273.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17520 bytes
SHA-256: 370eabe90c27b3e936372f7502b9b19d32aeeb6c0cb4c6b7d185addf8d150122
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 10728 bytes
SHA-256: dfdad710b109d6401e5604c6d6e1cc161790a580742ffe4da59e0298b1589181
font_03_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1