Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5ace84e9de280f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 05:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8843c63c34ea5b59126b66153bc1fe1 SHA-1: 24907117296671f52adb26746c65e43001007022 SHA-256: bd5ace84e9de280fd6cc4519090ddd3586b57eea8e74fcd2f9409a13aeb9386d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL further supports a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/xobemixatolodo.pdf In PDF document text
    • http://contua.org/userfiles/file/83005516415.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11485731989.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/79959564668.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/64514825045.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/70933284335.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/namojakete.pdfIn PDF document text
    • https://avela.md/userfiles/file/digavinugotoguwiwew.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/jafovoja.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/25128874327.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/10305039574.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/20917734028.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/11180661402.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161416ce770eac---30197078484.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/fusimorodoviridodolujifab.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d267973d7175fae71748e423aadd64c4/tuwonematun.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/dolujajexosaxojutonekep.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k67055u2codjmnnp41587ac5g1/19963475327.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/72550065745.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/xatebubupofovigaxif.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/74570705646.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd443c9232---kisibobo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614176fb08d15---99930364159.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/88395d9d907ac47680cb25929f8426e3/rowinar.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/zotifizudujifugefuvel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kick+the+buddy+mod+apk+hack+downloadPDF 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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 11036 bytes
SHA-256: dab7796378839a0c16de4600dd77d81759b0bfa47ef2d7155ab7d974d1783293
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 17344 bytes
SHA-256: 4859ac55022ba9c32fe12735bb5ea3306e33ca66ce19fc4362d9bf267632773a

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