Malicious PDF — malware analysis report

Static analysis result for SHA-256 726c2100fb5212e0…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 17:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e507c59ab131dfe4819351a41a8e2bf3 SHA-1: fa338522534f8a49149e4eb8044cc021c8752c97 SHA-256: 726c2100fb5212e04e6cdd5f53efb1453bc26fca990aadce3a8a94185920dfc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised CMS platforms, suggesting an attempt to lead users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the presence of numerous links to potentially compromised sites strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fee70987---dowodipubub.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff09a554d---73360837327.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/253f4abe3d262ff9e0c88a741cbb8463/lunipupigojap.pdf
    • https://damiel.eu/userfiles/file/10296662402.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/g9g5i232i4ftgrvlot87qss7v2/mugovobuxesojugedagakirek.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/59952321196.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc6de8bb7---wapifuxibijowet.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/76648510975.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/421d3fc1fe813dac639a45b6873b0d30/11375868533.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8507e8928c---zotevekadevaja.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/kv7gvkugkjfe1155s68qa8n4f6/vazifopazuvebamu.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4f643b3e51a88d5caec22ad48885d70/wofazip.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc85c61ef---9150447205.pdf
    • http://assytekservizi.com/userfiles/files/18924578312.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9342b3a0211080a59b45c997741ef554/83158544761.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c70204ac80a07b26b013bf7a48b0c6e6/limegebepumunufalego.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nd149s0ljloo0ljq11leb7r6u5/38970876382.pdf
    • http://baiduvpn.com/upload/files/xeladijo.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c2b8b888ee07deac607cbf16b187d6c5/62352326391.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mbime794p6qkncc61oh0a03mdk/44070604358.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/bulefepoxo.pdf
    • http://rajskiewakacje.pl/userfiles/file/kiwuvi.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073105a284a5---rututonovebozuwapik.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ensure+meaning+in+english
    • 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_off0000dd01.bin
5af5905dab33f8108dc6fb247cea395660293e243afb8639eb1788b2fea783a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 10420 bytes
font_01_sfnt_off0000f44c.bin
c85bc9b35c845939422ae9c2c1e912a8b8e47bd841214c4814e101f329ca044e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 18748 bytes
font_02_sfnt_off00012612.bin
1b96b0cc034650adc934bcd311b7f1a68a16e30071c0f268675cc50746c78ce7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 17548 bytes
font_03_sfnt_off000140bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 16792 bytes