Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a195783e44571ba…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 18:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b32e368c02842a97ce7a6aa9825045d SHA-1: 0582f1542633ed729910fd357d1a127ccb0946e9 SHA-256: 5a195783e44571baa44da0ee97ba61d82a18362258c4c2ea5498fe88e423f4f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to redirect users to malicious sites. The embedded JavaScript, though not fully detailed, is a common vector for further exploitation or redirection in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heibldr.hu/FCKfeltoltott/file/75236190388.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfbfa6f37---81754680432.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/titupozepiwibagofaxonu.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/64253701669.pdfIn PDF document text
    • http://synphabase.ch/upload/file/tufirawijajupatitogi.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/97828726805.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219108328.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/musetijirepa.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191263382877.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907073029.pdfIn PDF document text
    • https://harom.ro/files/file/83953739886.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/2026349632.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/dewesetonufuzu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/33974574296.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82438400797.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/45602423975.pdfIn PDF document text
    • https://cmf8.ir/data/file/lakelixigekenu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/lojabubanupiguranolupawed.pdfIn PDF document text
    • http://uteambio.com/upload/files/38451319189.pdfIn PDF document text
    • https://halkum.rs/files/62732192127.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/kanetojugeliditavubakor.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e734206f04---fuxowunugotexumulurut.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613835134d5cb---33167051067.pdfIn PDF document text
    • http://hueide.com/upload/files/11962194509.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/gifovopijabipuxuzise.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/69125700912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=monkey+bubble+shooter+gamePDF 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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16740 bytes
SHA-256: f60a02973bb12cc9662bf38f9eff88d2ad25acb0b8afc4bbb06579add5e9bf64
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 10904 bytes
SHA-256: 1ed6bfd2417337282d3ca0d5d7c66a15dc6ef78e2627131110238adcb195d924

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