Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa98d01c04f26226…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1fee308eeeb8aee44756e12635d2aa3 SHA-1: 8af1aeff1f2e4db9e17fff14214d7172db7f5197 SHA-256: aa98d01c04f262261f7f417d16df39d801e4ff18be41d0431d46dd9a46bdf57c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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 https://garglob.ru/uplcv?utm_term=petit+albert+pdf+english PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446df0d612a---julivek.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/52154218837.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/49366396862.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sadip.pdfIn PDF document text
    • https://robodom.si/files_vsebine/piniku.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/19777804783.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/lutujukivisunarijoreka.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/9ade88a1dcd5d37b6105e3b016ecb8b4/zufutut.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/4597287437.pdfIn PDF document text
    • https://greenways.at/userfiles/file/45417795742.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2m0oodvcub654fbrg5jfg9cd4a/kewudizelavomik.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fuwebilelikusomanun.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/xifivop.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/99222982725.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/zubonununalej.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/tevazedi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kovavitunodij.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210922000313_1jp6bn.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/tasixudugikinazidoxos.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/saludaladelofatufune.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/jazasuxulerumujo.pdfIn PDF document text
    • http://offerparts.com/upload/files/rasatovijevuzodi.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/12856770488.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/molububeluxif.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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 17580 bytes
SHA-256: 9b5469be21fc002c5b699eb4d8461c885eada0001d22abee91c817ca8bc87af6
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10796 bytes
SHA-256: bd4e95a63553a0831781f12fcd1d185045276584fa1331b25fe5200b9df7cd6a
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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