Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e0e66306b63fb3…

MALICIOUS

PDF

114.8 KB Created: 2021-07-04 12:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2680c20bc65590c8957bd6a7f9b76d4a SHA-1: 156883deb7b5fd0211e49a62ccdcd31239824ddf SHA-256: 87e0e66306b63fb31b6d4816c983cad814ce115a1e21b91a773672ee003894cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9669

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 http://perlawarmii.pl/userfiles/file/8546009918.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/zanevovobadiso.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/muvevisun.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/93b992ef376a7fb3cfb08c5de60aa360/negonawokelos.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lpc914chsuikrkr48bph78ggcs/57555636829.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15fd52c2e---26779080343.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8e17e793---10078262647.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b939ad0ae7---41843414689.pdfIn PDF document text
    • http://novichiha.ru/pic/file/38910451343.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e96lfsj886il2efbdnrerjool8/4718514968.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/mekites.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aff5e144c---lexodujonitekora.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/telememuwanidolamobepez.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb114a895---95326619646.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1148f56e---noxol.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/85909823714.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e0ff036dce8822784c771bd95156821/zofewufugat.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b414fa6070b8fa819582106ea2843b89/kiwomiwunim.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fbc1a644eae2144915336658264d1185/50760454627.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783cbb6d759---48427257886.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/dozitamudi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5mvcj99qgottj0lpfa2qvp35qp/50883816549.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/86136537216.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/jujuvawagewafanofaziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+inexplicable+in+englishPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f76c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF76C 24448 bytes
SHA-256: 51bc88b3f506daf7febb1896f09be69fca5a613aed9e838ce3ff60676c9196d7
font_01_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 10796 bytes
SHA-256: ef4d97d0dee900e1fad0df3fc7a9463584f5152d63a087b983c07434530979ff
font_02_sfnt_off00013e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 9808 bytes
SHA-256: 0af6a35e36b7e0e0243dfdf49c7125e783bc4a14e680057ed788902dd8714491
font_03_sfnt_off00015db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000175c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C2 29748 bytes
SHA-256: 3732363836f23d285689daa909cd0b00e89aca06541280929f2bd4ca92ab4b78

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