Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dc87862157c618…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 21:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e204b2bbf1ad874f9bb7bbe2ee134036 SHA-1: 58838942c6edaf67d8a58e8f07b688b580136649 SHA-256: 19dc87862157c6184ef713891e2d972d2847fc6e94bab78a289d1678ca2150cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://motoren-adachi.com/js/upload/files/sewasugofizawidivu.pdf In PDF document text
    • https://westhygiene.hu/editor_up/fusutematarimanewirosixud.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/36096919920.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe86250d4---puzir.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/72306506201.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nuwizugelitek.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/68681022048.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/97303328881.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/38461260863.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zuxafirakig.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/3408917520.pdfIn PDF document text
    • https://eternalbliss.net/file/99267323257.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a98bbaea1---moferumibore.pdfIn PDF document text
    • http://pronobile.com/catalog/file/77470971011.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gikimobazexevagemi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/50232849536.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/wamitunidow.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/853596430.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/29107862513.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/dogorul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132553d4e319---98967493068.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/65767343300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=4k+hd+wallpapers+for+androidPDF 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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10656 bytes
SHA-256: a5d1d79e290307817059b1110931a24cb2740de7cbf6a0e7b09e42d4e2347b95
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 18000 bytes
SHA-256: 50f57dae616da11c5717f5f761847a4c7ca559bdab6cf0e43bce8e83a7921c1f