Malicious PDF — malware analysis report

Static analysis result for SHA-256 b633af362b9d4514…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 10:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6706680010a26e9842fda37ebff87d66 SHA-1: 2a8170257601e0d2972810f58a37cedcce00343d SHA-256: b633af362b9d4514b3435c106ddd7e4de9ebe2bf156eefd1a781b7303fdf95bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to compromised CMS upload storage and disposable hosting, indicative of a phishing or malware distribution lure. The embedded JavaScript stream further suggests malicious intent, likely to facilitate the download or execution of a secondary payload. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=what+can+i+do+with+courgettes PDF link annotation
    • http://studionegrelli.it/userfiles/files/zixasalajuresafe.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/85175008754.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d9ebc8cf---99439463507.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zubafekogamurawurevavuz.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vebemaremefodeweri.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/bipitepuzuwadediwolej.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/fodonor.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090820265533.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/ladogajopijunivusila.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/militisewixiw.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wutekidunafudep.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_B7D2775DF2CCAB44.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/limerejubuxa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfddc2bff---rusovipunozolozufor.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5a17d42---xeguf.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/voxirilit.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/10417151689.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/41407284863.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/botesepogokopuzopoweli.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/migusenimibok.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/butijevedataxa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c3285f3bf97c9eba03161947cd45aa3e/gonopaloxowixewowusag.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/kaxepuwasipozanidobam.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/naxiburujilir.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/87215238763.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/17835623999.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_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 18996 bytes
SHA-256: ef6599c8e08583654d52788c8a2c0a20c6961f023e436258a94d3195c00a655a
font_01_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 10780 bytes
SHA-256: 802481b5dc7e793e5848cb57906300a50a5ecad91d0b73285e041d58cc272483

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