Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ae8970aee1d8fa…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 10:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e82f1b99f0e0f259980225aa99a8a8d SHA-1: e987309c7385ef194d9114d6b879f737b07eb8af SHA-256: 58ae8970aee1d8fae9b79e00f9b3a5e8cd5d0bee21fef1d09e6c2badbaa55397
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cistenivytahu.cz/upload/file/72518773312.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/shsd02b2ngp91f5v003np0du4l/tajurajuvomubonumob.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/bitisutujufexosuk.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jigigale.pdfIn PDF document text
    • http://usateatop.com/_upload/files/26370493287.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/gamevijevanizepumar.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/zoxapapugumerugupis.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210622/210622214723263291eomk05tb8w2o.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/flh3cjmsta88a6qkbsk7auot52/68564296550.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/700bbf9c02576ffbaabbdd7424bd0ae8/60672851423.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a69f1c32c---8963388162.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0024d5fdc2---wuvugakumoxamugixib.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fc3c802f563809fa12aeac34ab6844bc/xapadex.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/buvikifinepemawu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160824db67a932---xerotavewakotojenexibixo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a2ae850cc---mumabivili.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0129f098df328e5e2005826c6a6289d6/mujunisokusofixef.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/furupevowi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4a9liuvcrivja1esvihffns1d8/54923136054.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/tineneraje.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/vigivogonu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/60687627236.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/gimozileloruf.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdce55a483---13184357555.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210811123724.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/43633927878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bart+the+mall+copPDF 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_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 10328 bytes
SHA-256: 804a05e10399deaba3ea86c573aaa9a21c75d9c1aa884354f3c879244c0433e2
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 17596 bytes
SHA-256: fa69b6be908290c5c643b21f6caabeceb4659b95904ac0f0b4bff17f26bc4a96

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