Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd248de7530fa807…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 03:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97c8a36eda5cc095a6e42e22295eee46 SHA-1: 06442a401f1c69a22853f75e7810909d58a478b5 SHA-256: fd248de7530fa807e26fd7d1e157b484f46ba67302e30af27d63c42ae786d185
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://electric-kernbichler.at/89087139937.pdf In PDF document text
    • http://synthecinter.com/userfiles/files/98574647803.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/72922634473.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/rubarekujetudaful.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/denibe.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/44439365515.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/61352874506.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/26739000295.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa745cf52---37961411966.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/nolasugorimawegefegomup.pdfIn PDF document text
    • http://lagrupacio.cat/file/gezofepubedigapox.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/tarez.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/87641536776.pdfIn PDF document text
    • http://protezas.lt/i/File/70916450787.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9ucjn4bli3h786vcbf1dr9pqd7/74291121804.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375876093c8---zaguwatugu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tudivesedawavizagifuteput.pdfIn PDF document text
    • http://cobmedia.hu/include/45209066659.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/meteji.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9c6812d9---zizekijelekujerekapoz.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/vonajozuzefixogavomix.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091006092554.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/xemowisizelugavenonumora.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f35ec92---46591139028.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/4951843063.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/94693105390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cast+pro+apkPDF 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 9996 bytes
SHA-256: 3ef93aefaf76bf7b66e07f37f2a4deecb1fda3461f806a949f810b5178a9b22a
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 19856 bytes
SHA-256: f629543dd7e3c8c5478b08d6417f7ace9105c028bcab6e3781ef9c1e89c5d775

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