Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f417aa32432d0d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 14:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d03fce45f6509926ff7accb73709a1e SHA-1: c571220536c0f2415dbe6cce581266d2cf44230d SHA-256: a5f417aa32432d0d4910b5b2e94cd1ddb621bda7c4b5b6afb1212bb1c8fb45d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links pointing to disposable hosting and compromised CMS uploads, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://raegcafe.com/uploads/files/selokinodizozafexibeloban.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/49423460192.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/xawisadixanazoxavagaz.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/refesi.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/50752470415.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4e51db8c---fomolafajaxupage.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/lazofukiwun.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161331784e508d---fupotuwas.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2ed9aaf8---14512463955.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/tonomulul.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210911191514.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/xuwile.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109151301397901.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/bonofadefu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/wekimatiripijurumazuj.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/rawigej.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/60673595600.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/1642010200.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nudapofesiraxukemeje.pdfIn PDF document text
    • https://porfic.com/fotos/file/31055943912.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/65646746274.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5abfirn8tdbhv6r56bj07tqs80/soxenilejanik.pdfIn PDF document text
    • https://digireg.li/upload/dimadupizolofukasuxifip.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/bidelitogakavawuwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+reset+my+network+settings+on+my+androidPDF 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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 18444 bytes
SHA-256: f17fba9c84094d4820713bd8e1c0343eb5b57a57e1e897c8b1ec50191db583b7
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 10828 bytes
SHA-256: 3917897d0e70d33fbc74127317a6c9ad8b864140c02eb052e61bd540be87e364
font_02_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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