Malicious PDF — malware analysis report

Static analysis result for SHA-256 71277cb82e79bfc8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 06:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c85811619d7f912fb4f5fd3af86c77f SHA-1: d87b8633b2c988128c4b96b60504d149de245d18 SHA-256: 71277cb82e79bfc8d70d4e9ffe380705e6b0035dbedc4fcedbb3718da032ae7e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress instances or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://rbtyutj01.com/userfiles/files/54179524471.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/38dc0288dde7a642cb39bbe8e7004a06/66334626702.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/48858470047.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/anq2ctomsfi0uvarq5clk8hdb7/mebuledoro.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9178f1456ec857e4115233e03781e331/kizuwa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e515093d0e---28710963705.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/roriwebilunadovove.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608058b257ea3---xuzunuwureximegule.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb1f71ff5---44365926894.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/38709282850.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e0bb9e9cb---63949661569.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/34423417242.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210724024509.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/spe5dn1isl3346juqfb9d1gtsa/53203367114.pdfIn PDF document text
    • http://vswet.ru/f/satabajigamitejinoti.pdfIn PDF document text
    • http://friulanapanini.com/images/file/fopovosowamofupekovamuzi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1c0923a72908310de0bcac79d7f43dfc/32471935187.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jonozajozewomonatixofeb.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/96501086567.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/48152106205.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/vekubisakafomapak.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/36028125322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+to+word+free+reviewsPDF 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_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 10464 bytes
SHA-256: 132fdb49023bc72b81e9178f969129f011149a8f77170c00099af863f99b9ee5
font_01_sfnt_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 16500 bytes
SHA-256: 2fda37a8bd87924eb78e654037d719d73784610339576fce0696902d24af44d4

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