Malicious PDF — malware analysis report

Static analysis result for SHA-256 d544b1ed439abcdc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 23:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e920c81241f4df7b40002ddec5410450 SHA-1: e067ce22046786c13836856279bbfc7875331572 SHA-256: d544b1ed439abcdca1fb01c3ab8ce70c7930b984bfe52a3f935ad21b5951a0a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files or phish for information. The presence of JavaScript indicates an intent to execute code within the user's browser or PDF reader.

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.
  • 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://okmarin.ru/userfiles/file/fodapasegizepelijog.pdf In PDF document text
    • http://giorgimpianti.com/userfiles/file/kuvaxepoxakosuxapup.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zukimopofojaxi.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_180051.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/ponevopofinat.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/simasisagosekovupegijir.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/loponuba.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/03cd498915169a05c2657cd9b86a2bd7/64995508066.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/15690504048.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/bubuvowazenamizipazum.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/vokuwizitagolexunexub.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/fubigi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146c4e49d893---mepokofixurowiwefaroju.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d19c844277607bccf710f0f1b9004053/fesenufuvujenebarowalem.pdfIn PDF document text
    • http://master-br.ru/img/file/14578157218.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/89481844659.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/38354670349.pdfIn PDF document text
    • https://baglab.pl/galeria/file/39831119508.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/josotibo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/85310124074.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/botarudorugez.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/23026635699.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/53496682601.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/97910851252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=builder+class+in+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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 19076 bytes
SHA-256: 1f03b5517a7c53f633c74c66afba7ee3a11ae2246a4000117429b458111dc98b
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 10420 bytes
SHA-256: 49b129f0d3da6a78156f5e154458fe7f056beca1497501069fc186f24eb87b1a

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