Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a2c64efcce0047…

MALICIOUS

PDF

110.5 KB Created: 2021-09-01 02:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b62bb1833e5117d5e872b992dbb616aa SHA-1: 19ff3e33cd17c7c6c616a152a3143068f09ae2a8 SHA-256: 78a2c64efcce00474f43ae87e17a98fa249435b6b758f30d5591a70992cef073
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and using link farms on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the nature of the links and the 'PDF_RANDOM_URL_LINK' heuristic suggest potential for JavaScript execution or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://vamaconsulting.sk/userfiles/file/30002257166.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/70559111505.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/49480234504.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/69408126317.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e936a1c727---34232835640.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8ebeaa7f---dibexij.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/gagatu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507053104.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa651f8c3e3---kopilenojakujiga.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/56424129801.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/napomefifukedudosidamis.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab435725c27---mogopaj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f818d715a9---vodukezirudosupaxojabemax.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wupaxulobowererezawew.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/bafekipokumagisazajadarin.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607249cf183b3---duzinoro.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a853b789e61bb6f7e5be310cdf48ba48/81838038344.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tejunowatogolonajavafo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f392a66879---bepezutixudijufisuf.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/zolafedefitorez.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/83051858800.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/54066937977.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050912434899.pdfIn PDF document text
    • http://splogservice.ru/content/file/32482191550.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/89262291496.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/72644493265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+lion+king+google+drivePDF 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_off000142b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B0 21508 bytes
SHA-256: 7d50741a1dc98221d5b199d79655977cced064d2e3d082e7d544d5aee077fda3
font_01_sfnt_off00017bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF5 10220 bytes
SHA-256: ef8bcc826abf86aae014268e9df968d2b70c3df15a505b15760156043aa0d756
font_02_sfnt_off0001928d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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