Malicious PDF — malware analysis report

Static analysis result for SHA-256 75af62a05ec8fe18…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 13:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 799fe7f5bd35466a61e9bbb3df00e1af SHA-1: 86aa5d3128663af8148e21a42a342a9585858472 SHA-256: 75af62a05ec8fe18fe828419d6d9999ee8fd2215181adc47735d1dcdd04db1e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • 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://chemtron-vostok.ru/media/file/26577186068.pdf In PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/76529365208.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f02bc2b76---51849372233.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/51337149105.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/74007453841.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/53348278752.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/zojenapafirujewag.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/78cb489872ad2c689b1a5e49fd0d697f/26582537847.pdfIn PDF document text
    • https://noddy.nu/images/file/65925918344.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/vamidedijevofofuripedub.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/24162203360.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/45208943152.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/10983937331.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395ff8d156d---dituta.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210915231520.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/judoligujakuvabilasatal.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210913_090443.pdfIn PDF document text
    • http://workontext.ru/media/file/59456253244.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/teviparovilunavate.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/vodolekiva.pdfIn PDF document text
    • https://n-tlg.com/files/file/fedipulupejojaj.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kebusudazuxabawileri.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030908077659.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xekanuduxepuxerarul.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/91286547543.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/97225358902.pdfIn PDF document text
    • https://protum.se/file/31305327752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fortnite+hacks+season+5PDF 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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 15504 bytes
SHA-256: 542dcc918905224d97d84b028077c8dd8183d8571b81401b4f3cab1b7540e853
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10484 bytes
SHA-256: 134f0fff6b49f1d9a4c47502ab91f9d7457c2f68ab60948dc1657f7cbb316be3
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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