Malicious PDF — malware analysis report

Static analysis result for SHA-256 978d403cf9169263…

MALICIOUS

PDF

101.2 KB Created: 2021-09-01 01:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 363911c1ddf37c2f3b1f3ca814f01733 SHA-1: 660a5f77902cfd4e8abffb24f55fd844414061b0 SHA-256: 978d403cf9169263e1876957ef712932c7b18bf2b148f368125d79face83408e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://smidgel.ru/uplcv?utm_term=heart+anatomy+worksheet+answers PDF link annotation
    • https://hanomanberjaya.com/contents//files/4000545472.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf676cf3b59---92755324219.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/5120761123.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/486a3cd2eb603d2f27b7c62b65f502e1/bapadusud.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9f1bccb271edf54e0aedc82a04cfd048/72057578069.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/34492498068.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/posudemuguwavibobumewo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160806e72057e4---71143562461.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b63bc3295b3---21904942813.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/43937336529.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/92833541188.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/aq2n7ghl59jeatfti9cl17lhm3/zowejoxomuf.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210719234325.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20218212247248.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712d44870e---81062317194.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/munebuwu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/57596085546.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210821103751.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e34c1d917fe---89353194124.pdfIn PDF document text
    • http://berbun.com/user_img/file/57213612797.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ce74795503936c83b64985f53cfc7d48/76248545385.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfd48e3dd0---82563747190.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a26209d---37007036818.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/nidil.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48718117029.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_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 18004 bytes
SHA-256: 3d88513f066525fe4e339de199f0cdc794f6b1ee98fdb31c9bed9bfd9f85d417
font_01_sfnt_off00015611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E28 10516 bytes
SHA-256: 21b2a6713121c5e015b54b06454ea8442803584fd44de02513aa76f4422a58da

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