Malicious PDF — malware analysis report

Static analysis result for SHA-256 a349aa8bbfff3ed5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-09 22:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8ae2dcc097031f78f77d061f3139e11 SHA-1: f35e86dace048f24ba06e83341ff3fb082e7dfba SHA-256: a349aa8bbfff3ed5807d694c289aa4ab677caf0e04232d943c3173fb524ad5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document's structure and embedded links suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=k+to+12+curriculum+guide+english+pdf PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f151e0d08---xepamotezilokajazozu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/jimaxuwakapikopadi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b423b6151f8---39470707785.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6e856cfbb39b4d98e45231b9d01fcb91/gifetenediwawezo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kuxab.pdfIn PDF document text
    • http://tochuchoinghi.org/files/sutubusowatesaxanilewik.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/kubimarixanamirinuto.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1bd186ce4ed111f1f6054189fcde071c/jiribejomuwevivizemigagel.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/720767b1dcfab0120f42621a211028fc/23425703689.pdfIn PDF document text
    • https://jetaime-shop.com/files/84717817463.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9e1f6f8bd71eebffa68fad6feae42aee/sasefafuwunamaxisemona.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/60299167974.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fe55934288ade33933d4ac45ea1ec823/zoguwipikuporavefiji.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/vusuwaro.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/39a3634f69eb3a03f50024a35ff73439/pivoji.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/sizazafob.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1202824cd6---finetoborisajitagiso.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/23c0835df1623ac7130b9b3a90f2620d/fimibojeposejulasodawavu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89b4b49dcc---wutuvifa.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/58658243579.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33a06d982---90410434673.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff99227493---dojij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 17224 bytes
SHA-256: 423d5a424a22667bc30c19df63af7a5132d5dc821b90668d9f632fea81a104b7
font_01_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 11168 bytes
SHA-256: 572983493827df4ebcd7e44b06de9b2a5d59e7eabe5ac7caf1265e13e95e0208

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