Malicious PDF — malware analysis report

Static analysis result for SHA-256 76601b00f50e1b17…

MALICIOUS

PDF

94.6 KB Created: 2021-09-03 00:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eba311a6c86ead1d7baba44d2e50d31 SHA-1: 8f1b3496ecf61dc95528455015ee73c2acfe633f SHA-256: 76601b00f50e1b179440c5784b13cdfa1f4981c27c58de06560c13e3eb274f1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://avision-italia.com/userfiles/files/favisutuxevesenemoz.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lgmrm11mp22t6ui939da26bate/nabegovezemeralikox.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/147o6agurriv6fh81l7keduuvk/bonafirevumi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdbc81c184---ribakumuziwikawomemuw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96604070c---wejegovinibebew.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5q2ov2qgjah3n8lpavpnqul3rd/demifef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b3ce6ce1---guletugikofusofunumudop.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8f2e138cdbe58160c6f155e47ca045b5/mewepewitigigijenosoz.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/kukadafudovorafoseredoxer.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lunevi.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/wexapudogemadad.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a010ed3eb---81538755099.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160736f633b60f---4398988676.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/gizoveb.pdfIn PDF document text
    • https://taperagi.com/contents//files/vokepuvavijevubuxawebo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jubuzozanukuvojuwabitofu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905afe16cc8---zobanoxafadinen.pdfIn PDF document text
    • https://zhansq.cn/upload/file/pibodusapas.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3d600090---99840299503.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/vakebivukopofazotog.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/lixakeganiv.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/vobotukuzijazivu.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/kamalarawobujifuxivu.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/81067265108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=types+of+oral+corrective+feedback+pdfPDF 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_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 19500 bytes
SHA-256: cf9db4a7fd81a99c59b732552351b16898b748274daa025f5fe528ab342da987
font_01_sfnt_off00013b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001536d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536D 10884 bytes
SHA-256: 2f3d9870dcfc65bab8d63d150d84d918c21fbbd3582040f8141de31f6717deb6