Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8255ba6db0ff194…

MALICIOUS

PDF

82.6 KB Created: 2021-10-16 01:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 699a99b45000ae1adf35be24f33be2c8 SHA-1: 8267047ca92bc74d90bbe18f3520f17f2dd9cfd6 SHA-256: a8255ba6db0ff194549b5bf27d488853bb450dbf9a47d084ce0ac9ac7d10756a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://drafthe.ru/uplcv?utm_term=the+corpse+bride+full+movie+free+download PDF link annotation
    • http://orthopediedelft.eu/files/fegimesopufe.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/21419600372.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea52227ce---lofitir.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/pedemix.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/25903675147.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161589b00cec5f---13862738168.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/40236937000.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/30502983557.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d23db550---noguzukijupawebod.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/53385856897.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/babovixepaxomonemux.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/64809974595.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/tibozu.pdfIn PDF document text
    • http://potlista.com/file/files/48966547322.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisolasomisovodefevugidud.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/vadowetojozemane.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/19587395811.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/sixiba.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/kotulobujozomazutawupiv.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/sazapapuj.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/deropalikikogo.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/48058791830.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fekulazuxakatonabo.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/69584079240.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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 11140 bytes
SHA-256: 1147dac9f7cc52aec97ef460ce8af4e6d7ea863d0d712651749fc6ee2b14cdfb
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 17896 bytes
SHA-256: 1769f0cbbd54f0bebf699561149a7beb0ad4fa177fdc9905ee5ac8d602dca53b
font_02_sfnt_off0001248d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1