Malicious PDF — malware analysis report

Static analysis result for SHA-256 941b924eaf7b1dc2…

MALICIOUS

PDF

101.0 KB Created: 2021-07-16 07:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 263e127a77767c05a09ed3cb01dd5c7c SHA-1: bc633dce756c7cecb4b48fb6fdcf49f88d630b5c SHA-256: 941b924eaf7b1dc2979b174f585216b207164e2000cc8a8aa9b05a240561c786
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://keluargamimpi2.com/contents//files/80617287830.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6faab7407e26de98331ddbc8240af326/xowozotudenuvoxavugomu.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/84995702310.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/63404567717.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c759880142---26796944004.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/palexagaxodivelotip.pdfIn PDF document text
    • http://hotstamping.pl/files/file/44340443368.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504b420bd4---23122093820.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/84964850062.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210604201506.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab692178a6d---lupevipuruxikupo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706e2728f3e---balisa.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/mitotimukatesutuzofaroji.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6c0180b47ffc5f05b81a7b5d06086102/zepusutelezapexi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608373485d0eb---19045360965.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/af30549dc5cb88e16c67b52ccf42a238/59385071530.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zimirilavoraputewitukaw.pdfIn PDF document text
    • https://rosycaffe.com/file/20741058348.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1ppahaf7v1bb1qafk5ta8jb83/mulaturipevabemino.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bonizozotigetakelujepa.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/8cski541mj100vl8snb66a4v57/88012634205.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/53295903806.pdfIn PDF document text
    • https://ahha.az/userfiles/file/27710294528.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d98f8d14b---zinosute.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c20ed7a63de2fcc4fc5706103354dcba/21499153709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=early+morning+epigastric+painPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 10812 bytes
SHA-256: 9c3309464ca3ddc4d7eb7b70db5af99aa035d3bc0e4318583d1f09bd7725109f
font_01_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 16904 bytes
SHA-256: fbfb920e6901bcc131ae1679edd28c38b80cb55143ae58c6262ec3c9ed0e3892
font_02_sfnt_off000157ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFB 16372 bytes
SHA-256: dbc88bb0f8f78a50af57807c5b6861d4753ee791b93404719cb06bb1754d3f8e

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