Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e34c2faa2ad4f5…

MALICIOUS

PDF

77.9 KB Created: 2021-07-03 22:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 66a740586fd81d4bc1f2f64b20e353b2 SHA-1: f19c4b7b53d93a91285ff80a2f993715ebc803b8 SHA-256: 53e34c2faa2ad4f583fd0d3c1bae8f73cc6bed2d4d70fb54bebcd99d32a10aa9
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 a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites. These embedded links likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://krisoc.ru/uplcv?utm_term=valency+of+gold+and+silver PDF link annotation
    • http://naplesredeals.com/userfiles/files/kalotanodep.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/molnmvenp66n8677uurfi8tck5/78447358913.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9e4d4a70cd482a3411758f79fa8cba11/23311468077.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41f34b138---xetulibusugugagewe.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/74407479414.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/417908669.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e116c860fefa0821b031b393d5673994/wamozotazem.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b31c95bad---88060044245.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a52a9406f26e0c39fc46cf64e4da25c0/wokimifolajor.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/89058351986.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/126331137.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1edee7f6dfc7d6b91287c0ef277c942a/daluxatobopemer.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5797c2c7de14d8dc7c110ef0696aa7f7/sadudawafusebuxobebebax.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54a38330e6acb182cdb8281c117f0038/danazixodovavet.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///somilavijokewopabotif.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/vatuvelowinupokuzirev.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7b235561acf4ae720c00127ef1c210d4/jubiwotasopunavoziwemetes.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/leragowetuvur.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/37188293316.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092161b2809d---binel.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b947c22a82---nijavasomababa.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/5cggg19bms3sue466dbthud6lp/11739975137.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd160895688---jixofupebonegudizuz.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0esmo6sq2oq7p4nj7dlgo76r1s/9126817939.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/221e847f2ec94b1a1abcb26112dc7a82/givimixozolalu.pdfIn PDF document text
    • 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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 10700 bytes
SHA-256: e0e53430eea85a253d5ddc86525bb2370937148e801e406ad98b5d251d1b2060
font_01_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 16488 bytes
SHA-256: 967ab81e3e46301957deb7424d926c83c753ace3a8bc95cd5e1b604a978808ea

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