Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e3bff80b32adcf…

MALICIOUS

PDF

113.5 KB Created: 2021-09-21 02:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26ff834dfdc5a900532ca12e8a0835e2 SHA-1: 12e3c9073bc05720c2ef1952cc33527ab0710512 SHA-256: a1e3bff80b32adcf9bfbb10ffd838f843655856cd971ddadc111462120b76bb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, including WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent of hosting a link farm for potentially harmful redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=tamilo+tv+show+list PDF link annotation
    • https://haruhonpo.com/upload/haruhonpo/files/mekadabanebebizo.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/folaxaworasasebifo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd49c459e6---59485113952.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tojoze.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/62966756895.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614901dacb430---dusifafuguruwefemevilo.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/fipazozepaworofegev.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/5817424472.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/85912176653.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69146824476.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/95663242887.pdfIn PDF document text
    • http://hanauhrova.cz/files/kinowoverijopezepe.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/kiwidekupejeferof.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jakoluw.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/65295722080.pdfIn PDF document text
    • http://dsagco.com/Upload/file/62500546001.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/88h699seupr8vv1mpg45kv22v0/66100517121.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/5493968138.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/80586856631.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/nexuja.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/ninafitaso.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/kuvokarixelivirejutafa.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_off00015749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5B 19124 bytes
SHA-256: 7ccf355193ba4482118434e306943fc3a9820b2aa1370ccb4b12deb58fdd48ca
font_02_sfnt_off0001a17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17A 10152 bytes
SHA-256: 06f895bbe73acb25f3507d96673b4944441aa8c8c54273a2dfa53bedada9dbe1