Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f0fa76ed4eb3d6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 02:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ab90f4e35a7c4584aed16efd5be7520 SHA-1: db6058d7852f64a7c1e52a2c17ffb1f9ed172808 SHA-256: b1f0fa76ed4eb3d6e8d845ea41270ae4e3981cd5ab43049b53a0a15c84c36989
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and compromised CMS upload links, and a high ML score. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The primary attack vector appears to be a link farm designed to redirect users to a malicious PDF hosted on compromised WordPress sites, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4fd541840f431e52eb88e0c0a9f7aa83/vivaxudusamobajimom.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9328d0d76032edab9b452a127341d0ed/xeworatariwuginuwepuwizow.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/88451873641.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/rigebo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/66b89e8b1f710305eb242ce0cd039d90/37065801669.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/lovow.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/keroferezubesivulono.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/37519d7c1151b12d712461f1d5a5e0cf/sabajubefudusuwiwevuno.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/fififatuz.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/finefexogobasamorofijiku.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/buxoz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095a60dc5da1---besuvo.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/witazesoforigipovasuxob.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059d38886c---retoremuzu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/er9c7oniapmop8hnn9ask3kpl2/lidamimi.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22316459103.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/kelemosetebazozagigekuviw.pdfIn PDF document text
    • http://furniture83.com/upload/files/mipokudesalosipodimuwat.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2ede5ba55a1132c1d2ed488f84a82592/35454590736.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eef3a361c---madutonu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e3200989---27593279157.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/87173773631.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8h7j3vpifu7i8ed3l84j6a6eeh/54871853007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=merge+2+pictures+into+1+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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 17832 bytes
SHA-256: 74e3660c857e37c84e2d505f1fc8aa6e8c4b98cd772d05613ed674458224611e
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 10852 bytes
SHA-256: 16a77faf6b9dc1ce4482de6dceb92751759bd491efa539238c374cf9c8fa4fa1

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