Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0ecc535469db1e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 08:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2e1f4b23bb1d7cadcecdcb167cbd09f4 SHA-1: becad4752b97ab40a74017303408377eb46fcf21 SHA-256: 3b0ecc535469db1eb6a808fdd3c51f9ed66fc0ebfabb989de1b3ac7e8476832d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous distinct hosts, many of which appear to be compromised WordPress upload directories. The embedded URLs, such as http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b80a01338---powajareno.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://aweibel.com/Photo/file/13745905660.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/4560505433.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887928c4a9b---pitolusuxilalinad.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ddf0301f6218a6f28f40dc9be0f16ab0/zixiwitimasodosakan.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5c156fc5---pevufelikazakoxo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b80a01338---powajareno.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a3ed541e6---ruxomowavivor.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2425e3b62---putevipamazeravilojimazaf.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/kenimil.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/dafolije.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/39b0448aa62c781e83743de57a50444b/rukebevobotiximomogel.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/qigvv5i188pvq8itcfdousvgd2/70457981902.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/119310deb457af19ec3026bb84896e6d/74321443860.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc86f0bed88---83658006595.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fosilobuwumilewudikije.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/68837811189.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de40e25907---50129228497.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gdj8ntecvfdmjr6gsdostrghc4/gewerojulul.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/wexokexaxikawelafepopemof.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/50403403635.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/38809008704.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/694f4e6eeefc2b60e9da8919c3fe4090/99718822188.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/7184907109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=microbial+metabolites+in+fermentationPDF 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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16212 bytes
SHA-256: d7a5d0cd001f02c37d3b76d0729392585003a47217d86d73ee42389c15cd08de
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 10632 bytes
SHA-256: 10ae8fd4ec3c2148d674ce101fc29061870ca49c01a75261150947dd64a29d80

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