Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae503c165238d0cc…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 06:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f58db76fd794d503fa65e84953ac925 SHA-1: ff006a959459a02faaf0675952ecf95e0be565d2 SHA-256: ae503c165238d0cc8dc89e34c271c7dcc51af6499345a2228c0e1b05b7a4a30f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, designed to redirect users. The presence of multiple PDF link farm heuristics reinforces this assessment, suggesting the document's primary purpose is to drive traffic to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://thaifilmind.com/UserFiles/file/3108009906.pdf In PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/45525200393.pdfIn PDF document text
    • http://reopen911.info/media/file/werepisuzomunakaluxul.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jiretupibol.pdfIn PDF document text
    • http://quinta.cl/upload/files/61672880442.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/69965748980.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/puwarurupelufevo.pdfIn PDF document text
    • http://thedreams.cz/files/romuk.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/14107521165.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vamup.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210917212719.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/17629981031.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wobukonosoxiwivowilo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144725c86f0d---jafikopog.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/42525082322.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/43920340391.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gagudezafesokan.pdfIn PDF document text
    • http://aven.su/userfiles/file/25764658297.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/45295098859.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/36325178423.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vi8kl835pdne31odlhjnkm6qp4/25225366733.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/mederotovapimugipan.pdfIn PDF document text
    • http://topas.lt/userfiles/file/jivemumebuka.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/66397463771.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed412fe6d---motiwudejomuxopobewetele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+see+who+someone+stalks+on+instagramPDF 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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10724 bytes
SHA-256: 101ec8dbaefedaa25850ad5279a90242f583496f719a762810fc63a03abc92f1
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 17960 bytes
SHA-256: f844015e5d22549e564470c2a4291805dd3020ab7405bb1884eb6abde87767b9

Open this report in the interactive analyzer, or submit your own file for analysis.