Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f498305e2e13fe…

MALICIOUS

PDF

92.6 KB Created: 2021-07-29 16:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 55a5444ff1b80b3e0db20b7631f20fdf SHA-1: 8e8953384187aeec0e3985d9c3c643b33d9b0d51 SHA-256: d9f498305e2e13fe740d445e1bb9bd977d252b1a87cf068743015a77564eb7ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, indicated by the presence of numerous external URIs and link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a campaign designed to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=kirkland+spiral+sliced+ham+heating+instructions PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/28c2a5a1c0f0dcc7a9a7f47c4c4397bb/74594455458.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/zofudunejete.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/33936103578.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/64d782750f47d4eb8f198ace5e93767a/94934951769.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8843b51e00d9d9d7f67eca517ab87d10/89148060659.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ff38a229---tesaluneditikinonazon.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/45877594754.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qb7caf1ieama70f0g0ql2uhe2i/zewinuloxawefewizewixet.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef46cc4ed1---51504872959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b05a92a7---833897485.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7rne3mpc5abr0dabascq94j73l/38690822833.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609847dcf0931---49925684334.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/delimis.pdfIn PDF document text
    • https://petek.biz/resimler/files/piwewimulupazuxuzipuleg.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/63929400627.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160794306298e4---faguzekumozigirawu.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/gubokamixaroxerafelam.pdfIn PDF document text
    • http://hodori247.com/uploads/files/79484925545.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/39081476122.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/vikekodovubimijowanivos.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8rgh4u94o3dfbrqpf8k6rtj7q6/64913825992.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2647f7a6---fajafivejokanukutefedit.pdfIn PDF document text
    • 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_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 17260 bytes
SHA-256: c400b9a218546bcb7848c67083ac7268c274575b5e943f896d7a69ebeadfd3af
font_01_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EB 11144 bytes
SHA-256: f44b5b62e9e18e30f406a87a309d9f1e7a7bb55c7b552ca3ad12fcebfae6120d

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