Malicious PDF — malware analysis report

Static analysis result for SHA-256 027e2e30bd97bb74…

MALICIOUS

PDF

95.5 KB Created: 2021-08-07 14:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22ff0d5440a408408166ddc67ab1b55e SHA-1: 9206ede97978b71503dfc81d0cba25ca0c7d5184 SHA-256: 027e2e30bd97bb74d976fa769d2121cd18e81010cb30dc7764d2bc8a02d0f844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also contains numerous external URIs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://catamma.ru/uplcv?utm_term=how+to+read+stock+candlestick+patterns PDF link annotation
    • http://e2ingenieros.com/ckfinder/userfiles/files/955636385.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6cbe57692aaedef3f92be7d8ece9a11b/54761731460.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/zolemalakaxevoguwataka.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f1162c9f7---woxowupepefevi.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/panodowivezajowijox.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe0d92f6c2---42130039593.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mvnia8mo403gf0jlk2o1f8ejt5/95265081850.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/35143366547.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9444fddf5722da7fe61a03565a9b98af/24206031652.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/fetqap2etnd8ij12106krs9orq/wiwigaga.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/77cfce97fd0fb482edae101df834e596/lisuwexo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/13216361234.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/vazozidusivek.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/tobupijukalo.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/13699045530.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/16575452744.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e36559025a4---46397604943.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bajikanixipozuxativib.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/vafizupujadusef.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/23834331014.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/2753908883.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/b7lm3v0e2ipatusoe8o49rs4pm/29364317096.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210715223024.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b56f001c22eb5c571b85a1d948f6a917/70485319955.pdfIn PDF document text
    • 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_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 10676 bytes
SHA-256: c617faad0b461b2f61db010b9fb622bd31ce5db55fb4e3699a0ca1699855361a
font_01_sfnt_off00012bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 16628 bytes
SHA-256: 3d16fc698a45e994b187c8ca18922351af095f48600614a5d33871569a4eefdd
font_02_sfnt_off0001571f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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