Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88a91969920d625…

MALICIOUS

PDF

90.2 KB Created: 2021-07-14 05:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fe3c52cf920d775f170eb5fb8ff3e00 SHA-1: 13b1c3f9733a86c1104a67fa55e1019637e2311c SHA-256: b88a91969920d62508231047db2ea5bdfc11a7320aedafd9efeda9f6eca4fffe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. This suggests an intent to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/lebamexipimo.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/497227e10b873b2d040bd7cbb48d9d7b/64490068036.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/libewulijenosupoduf.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/662e676df530be3b444d30d080cd5e5f/4708176388.pdfIn PDF document text
    • https://kaisar168.com/contents//files/dagij.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/37716246412.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf36d023b---titakev.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/m83fii67uvdod3ga6t6stkectq/lujawukovopofe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608914987212a---67947504582.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/74420506332.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/75161fca2df66bdfc076901b0963bf6d/xonovifetovaw.pdfIn PDF document text
    • http://citra.cl/userfiles/file/42248246212.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fadd149eb---63232749514.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/xozagukejokupotijixepuv.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gexivosigitapum.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/be981d4356d66f66ea434f2fe63fb1dd/nuwevijati.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jodevixojegok.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a31348ad2b73beb9610f8ab8438a113a/62211588853.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/satowuj.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/dufebiguwe.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dl8rouqsutvqau1eu6unluv7fb/12747257135.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8efd5628b5b0272db3cf71371640f794/rataduwogujik.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b742902e524---64493323348.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/82310273707.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4jhtvk9prugv70s400l6ia3tt7/zujisefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=livable+cities+2020PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10304 bytes
SHA-256: 1655368692fe76a9ac661034a40142e99ca91a3f26919f9fd9fd0b50158cf802
font_01_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 17912 bytes
SHA-256: 500ce75e54c3b17f8b5161d4264e7dd736dffd9229f43b1ea291ca0e00b420f1

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