Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba3232002cefc1a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 07:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 418636b112a66720f20371571ac82595 SHA-1: ae32dd7d76f9103755ceaaa291a356fa8b454923 SHA-256: 4ba3232002cefc1a5390855e8b41602817f1fdd47b9fa127f71745cb238c873a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The presence of embedded URLs and the PDF structure strongly suggest an attempt to lure users to external sites, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ahlhy.com/uploads/file/020828154964.pdf In PDF document text
    • https://addsfly.com/userfiles/file/nokulifefigukupigeku.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210627080221.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cltoaoh8tajn4cicm13dlnkacs/degomiburiso.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dcace76a498---60273864485.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/93783950881.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/fuberinenomemixewazanojig.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c8f620c3---39684693168.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1ec666ca---jemaritalupadowitiw.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8f323ebf8df3fb9293628852f1cbd03a/20593198035.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f27d9d225---narilaniv.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jvve642oncioq75bq3anv5lds4/kolakoxusidevemuv.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/18203475716.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pitojawizofo.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/35829716129.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/bupurozegumex.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qo9hgoq6it86lo2vto6b6cn7v5/vuzemugu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/u1m37m8vho5046hv0uackej3pk/15056079985.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5af3d6a5a17f93e2601dba30a77cce01/vabedivetigan.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092874748756---febevipukilunaresapogojam.pdfIn PDF document text
    • http://runo34.ru/attachments/file/60496617743.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cfae360c50def3116df6139d44d09ae0/65165571176.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/burumodonagotozikaporek.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc33b8d04---luxinepabedex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=animal+farm+quiz+questions+and+answersPDF 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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 17196 bytes
SHA-256: d38ca6d377490eada5a211c8a85209bf4de99d6639c9cb4f9f004c6968e079bc
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 10888 bytes
SHA-256: 7ae4e3068f64d7d6fefab7df4fb89ad9f48cf23aba903d2e03f2e3d0497dd151

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