Malicious PDF — malware analysis report

Static analysis result for SHA-256 589a0064e29d5fbd…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 02:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28fd242f9db94e91a7d7e3cb757221f9 SHA-1: e3da15ab035bcc4fa570fa1801e0769f98a8522f SHA-256: 589a0064e29d5fbdcce0869349bd2764ada905cab76ecdec07100b011fbaa745
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains links to algorithmically-generated URLs hosted on compromised WordPress sites. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the presence of numerous external links points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://corpusbg.com/files/fck/file/rozubizovuka.pdf In PDF document text
    • http://artgraf24.pl/userfiles/file/xatotaku.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/notazusaliz.pdfIn PDF document text
    • https://lasanisports.com/files/gowagaxomi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/pafibafiga.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/32853466909.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jatupiwojigiv.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021717119491088.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xowisidavorilugapakal.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/menapipugekulanobudilofuw.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609251d7ce03a---namozexupatojana.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cf619cf5384708419450b7efff6a1b31/mizixavidipa.pdfIn PDF document text
    • http://derma-dts.de/files/file/toxixibizamugidete.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdb382ca10---81337238729.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e5f73d01---sanidogawepukojif.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/xikuku.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094739941bbe---88157098032.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/1b6a9edad484411d658952472c68b985/95304144872.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gufiluvikadanulawanawuvu.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/bomujozujapak.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/63282926324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=guia+roji+carreteras+de+mexico+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_off0000b44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 17304 bytes
SHA-256: 4c7d3747f013bf5ef33cff1e7ad9f898b6cf6cbd918cb084091a834d408126fb
font_02_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 11004 bytes
SHA-256: 1ea0ec3e0ab2bb1c1335c53378ffcbe4f432e505e3386910dc4db1b5b52f1c54

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