Malicious PDF — malware analysis report

Static analysis result for SHA-256 43255e237c0618ae…

MALICIOUS

PDF

223.9 KB Created: 2021-07-06 16:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e16ed769c8c5699ef22b67108d283c SHA-1: a2c0d0a8509065d2f65d24149bc75e3bdb49a02c SHA-256: 43255e237c0618aea9fbe06dc6cc6d170e9eebf3e1404f1d5abd0f636dff1f63
126 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, specifically within plugin upload directories, indicating a likely attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample, so the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9568

Heuristics 5

  • 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.
  • 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5ff2d644---tobikolox.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kaaib7b8689bp0ild5t3pg7hi8/31180919131.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2548082556---775576509.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210604114358.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8425f304c---zoxudimedif.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4da0846f537a602ee33590d64961d092/88786769231.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a1e0b2248f1faac22796a5b86e74f73a/kenuvatifineteloz.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2c860978d30fd04aa9615c0e6295cea6/75099140907.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39e1d2225d---gepowoninekomile.pdf
    • http://allmedicus.com/userfiles/file/88700810052.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6ceb42d1f11cd9b6c157b28f30b62e58/99775629402.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ds25ag6361tjponve5l35c4703/81182671014.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fede3b00d---fulaxuzuzajew.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/qna2if1c7428caclq59ca0c5pt/68134543952.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb991236de0---zafogabe.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vanenevotonufiru.pdf
    • http://ausafe.net/images/art/files/joxanojivaxodobofadoku.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/pikozafezajukara.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/wixulopobasa.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/88610794294.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af2d6bf32bf---2870456528.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca6e6f2a5---bavotijogefulenev.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4220f0e3a---96154728344.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9209738af6---varofudupujeripedawu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/gs8hh8ushh7q18dm6j4v1efjq1/95357555757.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ir9j16dcc74h71lr06ttnbpirc/49558284454.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=probabilistic+graphical+models+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f26f.bin
827734c9a14176b07ffbe4001f35757089287b92d3c603a34b10dcbc6df87663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F26F 11104 bytes
font_01_sfnt_off00030be5.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30BE5 16168 bytes
font_02_sfnt_off00032181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32181 16792 bytes
font_03_sfnt_off00033993.bin
7fc17bbf1f8bbdb13de89cdb20fa4a6a8a0be0dbc3914b4e0203efb471006138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33993 22384 bytes

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