Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e78b1f6c66abd7…

MALICIOUS

PDF

98.3 KB Created: 2021-08-20 08:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8986e640202f65068944bce543027999 SHA-1: 0f770544ff97b34e35b8f49e7a82c5e8133ca36f SHA-256: f4e78b1f6c66abd7f84f7cb4b9a8648ee2ddacb335c3e497380cbd484c8eb3c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous heuristic firings indicating a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the embedded URLs suggest the document's purpose is to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bs8952qgvc77tuem153uvqsi5p/dezibipezokowo.pdf In PDF document text
    • https://himalayanthailand.com/image/upload/File/kibojisubepeko.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9fbe6d30bde108b962e4e97f8f4c7595/74849442740.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/ramutigadaraxes.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/savesalukadutazu.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/74047143245.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd19cbec6---zoxigudurulaworafegim.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/25945584056.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/80620921875.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6fcaedc78e0d7e7acaabadf004c9613b/tugud.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/xarotavifisawabavi.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/j06dreb9edm3sksolvj0ci4u67/xazinidovud.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/86618501376.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/12772a8121d0fad42272d7f183afedc1/komedukogozisinivemob.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/jiset.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/af85382d03f5f0cc72a3b75d27303cde/49895602821.pdfIn PDF document text
    • http://citranco.com/users/files/65551253700.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ab35f6f31d5301412a2e0c1734e34b7a/suwuliragaka.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lorugaf.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/36142953476.pdfIn PDF document text
    • http://billsky.ee/files/file/45708024158.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/45648385534.pdfIn PDF document text
    • https://aromamarketing.md/img/files/35977930667.pdfIn PDF document text
    • https://unosms.us/userfiles/file/81228138903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=california+driver+license+written+testPDF 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_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 18836 bytes
SHA-256: ecc8448158aee0a3bfc21f17c3283e5afa4417bd4b0c7fcef1692d3ccc44ca5b
font_02_sfnt_off00015f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9C 10652 bytes
SHA-256: ec7a024ab9a1b77813f4f2e973c0dca820c77b4f7ffe3f648aefcd39c9914a79