Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae193da207491f2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 01:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f5524ff9ca80edb988716de2bfb87b35 SHA-1: 880b94caa4c7483a81b408c5343d7d93107d3001 SHA-256: fae193da207491f2f2869f0a9394ef3250b52357bd7583fad5522cb37a74e9e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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 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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160892fdb5e6b6---10653836748.pdf In PDF document text
    • https://mandarinkinesiska.com/userfiles/file/wolapaziba.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/6686065241.pdfIn PDF document text
    • https://proxus.nl/file/53319459049.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/6552267714.pdfIn PDF document text
    • http://tano-cable.com/d/files/90236735809.pdfIn PDF document text
    • http://immopolignano.lu/images/zogeruvowoti.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/ditobodixinasupoxovigidet.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/6t14osrttfh37cof47g5mfd4er/nimusam.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/da8c8d8c5e561a5e2f033e864a999b34/weligesubozodupenel.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/14225573825.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/53i0kvqakmb000ot1aldcim36i/87197645983.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/37256269332.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc4714502---17547468006.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9slfbfllo0vojspp0vvsnrva2/bumakuxadobipusakanawijes.pdfIn PDF document text
    • https://foulardfotografando.it/file/zilexedibevirajamiwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609456fe8bec7---24231630015.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/folunetafaxopevazegez.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/waguvaferobugegoterepa.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780ed76f28c---labufufisolejez.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081812035289.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/8593755340.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/18922186124.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/6564157368.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/kasemibi.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/waxiwadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dr+ross+hauser+prolotherapyPDF 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_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 18692 bytes
SHA-256: aea04dce2e41467c48d99e7c373150517d4cff4025c611ec7900a8779c395f37
font_01_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 10368 bytes
SHA-256: fe8080bf1fa1717f4f7085d3f6fa9359172746070de592078c1de9fa656cb076
font_02_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1