Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2a3f24f85797f3…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 12:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3fdc0660c56b0ee50faeaaf77c8b537 SHA-1: 63fc3d73ea32a5c9b3e60b28706358a5e23c7b1c SHA-256: dc2a3f24f85797f3c0a868ab55088c13ff8bbdda6bad1d438cb1cbc723d01182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d43c02141765b83fc38920dba3896519/99841040829.pdf
    • http://pm-property.pl/userfiles/file/vemizoludatesedubuwofek.pdf
    • http://gesundimjob.at/images/content/files/62341519473.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/2810c63abce9626aaf7ab4281024e73d/zalopanafexatonejurobo.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0bc327faf---22749171813.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0bc99a72b8b68632f910e31867106de2/2196108665.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161306c2daf6fb---39945010714.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088042600b40---tujibabuvagugotutukaluko.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7a4dd55---zomabeledepotamotiwu.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6e99ea4b8---5462031915.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076494e7e31e---gitikenezumibomugeruzapub.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/39010386174.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4f76fb8b505fbe6aa2949a8f6630513/15778182019.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4e2c98aad8448541667a21d5517376d2/pojezopuzuzipogivapi.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11cf07364---jilumipujebetupakuve.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p575m6e759qltoi80522alp3qa/nuwijuburojuviramanoxo.pdf
    • https://alatheir.com/atheirwsfiles/file/55821970925.pdf
    • http://interwork.sk/userfiles/file/fuzanoxonilaxe.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36212725086.pdf
    • http://birnagarcollege.in/userfiles/file/pasugopu.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/folubukogejejejudobimem.pdf
    • https://perfectprojects.ro/userfiles/file/52865631373.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093c26ca7480---7038849151.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nsw+fitness+to+drive+medical+assessment+form+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa66.bin
22825b37af08079443b1cb8883823b1ed79631173cf2ca6916952df51d8a8827
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 17516 bytes
font_01_sfnt_off0001280e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 16792 bytes
font_02_sfnt_off00014025.bin
b580abe5c030d5d98688a3d3d9449a99fbb43b212731e440f4261e1289b28942
pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 10908 bytes