Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdce44da81b59fa…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 21:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b44be6045268cfc715870356056ec9d SHA-1: 5419031e3eef39d9336b04b47c359604d8055994 SHA-256: bcdce44da81b59fa80fc6e007ec91caf9cc4e6d4eeae21ea78b72c4116580b12
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=4cm+dilated+and+80+effaced PDF link annotation
    • http://fygl.net/uploads/file/27165854846.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/49322aea48383a18d613860ab6b2f3d2/kedowumudaxuzosew.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8ed3f54e---leminewafovalisiwosego.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b654054dd3f---lanow.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/18724317646.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20322743730.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa087bbd9c15155f3ad96b6c5d1fc019/41543785358.pdfIn PDF document text
    • https://digireg.nu/upload/63044701692.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/1338967536.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e7a8bdbd1---fesiboz.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/60981694225.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79862969388.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/ruserigazufopu.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210602165154_642807328.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161262a48a55ff---fawirodevakekenoza.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/36024018063.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/70247763554.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/351104325cd456aec9366638758d9644/wewijifosifugusodulolidi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611c969735db0---36399204791.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/dezufodakufumitefoxum.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qqcu66fc573uhsubl8j5g20h53/76480617929.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/kuxin.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/gitawefi.pdfIn PDF document text
    • http://beta-rc.com/upload/files/vusasenedesifef.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/83076846948.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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 10560 bytes
SHA-256: e679f738e3fde4939d11f5103698830cdef59e2cc945fd83485b081d1306566f
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 19272 bytes
SHA-256: 58fa0bc60c8bc83e64519d0d460a7ffe29d5f3403715543a63aa7f3bc706149e

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