Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fbf1439033fcc1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 03:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccf14578884c28c496a0ac0a33ebe6fa SHA-1: d27f41f6a788c6e93156a18cf3739f952bdb20b1 SHA-256: 99fbf1439033fcc1ebcc21fd7db29f70597087ac7fbcc58ce69eeb77b382aac7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to external websites, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://akconta.com/uploads/files/87397810781.pdf In PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/waxozemulojewezarej.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/33818755699.pdfPDF link annotation
    • http://dungcumaymoc.com/Images_upload/files/guzepegidiseli.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4b8648362a1171b7c598f8176b5a1292/76588708845.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/92606030378.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091003a9d6f7---bixatakasibilevot.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da41651ac5---poletazujedujudokedajizi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/34e5ad21e2aee39ccd09e63d983ffff8/16571863589.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1e578f3f74761a4e30796936a16edcee/vobodixopozarudezejomugo.pdfIn PDF document text
    • http://bankerz.in/qpic/files/xoxokokagisakewitu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/90244340127.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/np7b4i026tt2epupcp89akiut4/67779359974.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/48752591517.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rk9nmu735hnpg7hddfemf0el56/35331979288.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/30366752925.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/10obl26gbohdjjo4ikbpaskno7/febefevumobuleseseb.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/af3ed3609907fb0e06daffc55ee89702/18030345902.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab74003516---taziza.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16223809752038355822.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c4262b604a5b6b53bb31ce816178054f/37555392950.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b4e01a2297a6f2b4d14bcfcda3e29ad0/98800719429.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/16529567474.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1a696c520---73836067432.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/kajifasipug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cost+and+management+accounting+pdf+for+bbaPDF 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_off0000c69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69A 16592 bytes
SHA-256: 9045fa6d42891758fa91f21ef22649bbc6024ae7f41a61aa937868a40f9c0e35
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 11188 bytes
SHA-256: 0b84faa79e69c89adf130fadd3b8ae4972f18dbc13ab6c32ac8cebbdbae9be7e
font_02_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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