Malicious PDF — malware analysis report

Static analysis result for SHA-256 238741d6e2c5a8f7…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 10:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8796e30e770db87fff0f060b82b114fb SHA-1: d32049530c8881deaedd41c4482e9dcdd616dda3 SHA-256: 238741d6e2c5a8f7248311c8a0dadfa678fabb83157c7ebbcd2b61024889f62d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://moto-trend.cz/public/files/fck/file/56994205453.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0bfa7eda---98099609294.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/luzorabamosebuv.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fada09f0---foxupoxebunujuw.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079c59137a57---bumuzulegupe.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987cb48647---lopivavilaxitawasodizi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d111829---35010556451.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098a457d3164---savapedenujasewa.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e62718335---36274069177.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v062mjqbu40kn265kj9srhtic4/12911184468.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80302b5f5---40158587922.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6bccee9d---fudinage.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f121d534---libusevupu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075647ddc750---mabire.pdf
    • http://kjphotocon.org/data/userfiles/files/38496286401.pdf
    • https://codecs.roimages/file/38227560687.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b7f55e1a9d263f11385b904e39c8e646/36904049831.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/555273a5aa9e0265d567f11bc551d60d/folosaratuni.pdf
    • http://verynailscm.com/user_img/file/90511829230.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/bagaziluloberapanirolurur.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hlinqjn1jvqk392eh8tue0pk6i/venopep.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/vititejewonigawafusipu.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e3cd90d6845fbfd1863dfe118a24b3d5/12321166116.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+credits+is+a+regular+high+school+class
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014f.bin
3a81449371327f80fd52c3c63442a330446d5650188de8fb80357670dd87446a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 16856 bytes
font_01_sfnt_off00012d15.bin
833fe2f7f1b8978d15a4e9a971042b30eb487e77076854d02d073e51ac23e40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 11108 bytes
font_02_sfnt_off000146a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 16792 bytes

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