Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6d537838433a45…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 03:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 40b9dbbb2f13f8a07b6693ea35dbdfba SHA-1: ade090cd4945610bf689259f5aa10b4d09cdeacb SHA-256: da6d537838433a45fcdd30517f21bc6be8b0c2283fc936b3f0104e28a3a0fd34
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised CMS upload storage or disposable domains, forming a link farm. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/20f5dc9292b94511a078305a8f183602.pdf In PDF document text
    • https://pristineleather.com/userfiles/file/rafosewibefagofigosudi.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/80509529933.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/60050247431.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/xiluwidiletife.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/palatebuwe.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/melapeloguraduvunijozukiw.pdfIn PDF document text
    • http://fitviewer.de/files/file/dogulawuvuwi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/62669669822.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/zurixe.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/63504961322.pdfIn PDF document text
    • http://jljemc.com/upload/files/8743565170.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380879dcec7---lukokozim.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6e198b13---58445477257.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3635931d---penosotegi.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/94042303677.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/050708249813.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ladisike.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f50230fda212bdcb5e80883429550620/73025927365.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/95801990409.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/75508331718.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/56139989923.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/lexadelufivofusigovuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+pocket+edition+1.16+0.68+download+freePDF 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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 11232 bytes
SHA-256: a25ff1936a5020362b673bcc9f2e270e23d8c9df35de68f188ceb9b65e5e45d4
font_01_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 20060 bytes
SHA-256: a6c36095e2fd2e4c65b900b6ea3fb3f79a64079d43a6aff44dd0ea2a57bdaca4

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