Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b4830a68bcf632…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 10:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b888de87ecf0c635d198bbba07bcf5e2 SHA-1: 9fea07fb5647c3ee47ab7800de8ffd05f327c816 SHA-256: 16b4830a68bcf632b7f6741fa6ca9635732e3127c50231af49f467e7c6c08266
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a raw IP address in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gubikumafiwexuwefotor.pdf In PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nuxisidesakivadopowe.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/86971080402.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/xukerozesobubokuxi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/rumalerosadezamo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66c4ed362---sazoxarutagumunuzarutapuk.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/86911637723.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/37584960485.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/3333040384.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/tetidakarojipikopefo.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/busenupofolex.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/zofusapimimarajinelibubu.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/wadezejoj.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kerevozazasitokogiwuget.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/82924970859.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/74425267444.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jikuzekawunajedolopu.pdfPDF link annotation
    • https://vnycc.com/userfiles/file/91776220309.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d99b39f4---nupejepawakobir.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8ejj04r2v0i9dfsgttu04cnluv/mujawikavuvivunawobus.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/76615035735.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/tirategafafu.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/37233764110.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/53584935493.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/rukawodomi.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/64503128563.pdfIn PDF document text
    • https://huanghecables.com/d/files/90425042225.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442be117b7a---61587364766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=root+checker+proPDF 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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 19108 bytes
SHA-256: 72a1b27a2892c926f359ea5ea82be13ce9301bc3395e32a2e879d6a210430e94
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10036 bytes
SHA-256: a50728381568b53d0e76d0e4fd4014b19ae2d9c7eba40f35018b163ceb1dd042
font_02_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1