Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4780eb4d991df0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 01:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6000aeae61f3dee2365e836a683c00d1 SHA-1: f1bc0de97df2a263f7965f02bc71abfb0e9c108f SHA-256: af4780eb4d991df0056948a71509c5654f6b0157a2f02dd8d8197ade2b4c06f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=phonics+and+phonetics+pdf PDF link annotation
    • https://zabulgaria.org/userfiles/file/75169055871.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pefap.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d276c22fb8e88ff6541ffb0d8ee1cd24/44632751654.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/zajuzi.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/pabupu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/deruwozugafo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ee019befb421233c2ffd41ce4ca07a38/jemasutiguteseme.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e136e10287e---kututizenixu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c51dde0c207---62422630348.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2f451d79c---36126616678.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/42496262266.pdfIn PDF document text
    • https://attack.lt/images/files/loromez.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a059973036---retopewunusotanok.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/dobafubiniduso.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d04abcbf---goxusapazagi.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/50498823240.pdfIn PDF document text
    • http://sun-eko.eu/files/file/93193456506.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gopofo.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108181418021129.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/78042660322.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/rinokedadijokadowun.pdfIn PDF document text
    • https://ip-pharma.net/data/files/37734122457.pdfIn PDF document text
    • https://andana.us/files/files/xukudiduze.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d199488b6e3---daxowobutajezedunewume.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 17288 bytes
SHA-256: f3cbd403bbfbad251d9a344b4c014b4029c40cdf3b8f0089ca99b3f8f94e4e12
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 16908 bytes
SHA-256: 7ee2a21252a19504d296f44864ea3c7a48c694521df6e91b0288caf3a9a72b93
font_03_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 10572 bytes
SHA-256: 523ab4e46c697b2e846d02b89b10e1ea583b2e37571993fcec8c297456bcfd1a

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