Malicious PDF — malware analysis report

Static analysis result for SHA-256 b252dbea0c66ecff…

MALICIOUS

PDF

87.0 KB Created: 2021-08-31 09:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9e0c0b49236111ea845309cb481348c3 SHA-1: af9886539ee43de9d8d4840f455b4a279414d953 SHA-256: b252dbea0c66ecfffcd7dd3f4f6f72d050931744a8197e49e4f852d4c8ee5249
176 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 0.9919

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=1+dinar+in+rs PDF link annotation
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3ofa0436f9rnbucp2g99nkj886/lodaluni.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f42bf706---57881924121.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6445c6627897319aab2d35f879a36487/2628569812.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/tufamalukojulozasutija.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7b9429feb---niwesulewa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/fomogomewovufuwaxanoburoj.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/xukugakapabifijufa.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cpdr01nnrkd8u651eg9nufap8v/wipowarabawuramoxaderamu.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/11666944871.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zakotevud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d24604---78039811437.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/81361777198.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/98751836052.pdfPDF link annotation
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/84420420210.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e725f23e---votawatesofisuporelamon.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097d9768f4ee---38890092897.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cc9086436---37435573163.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/59217842619.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/tukanokutivofofiwumiza.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101248202230.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/15569354472.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/68256813278.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53007744c8---61811917170.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nimaki.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/98379988121.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5b73c21c9c62fc02c7b6827b2d643696/rigugolofavojirigepowe.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 9800 bytes
SHA-256: 361a81b16bd83d66e3d12cd89d119f1ddb39f53095136f172b0cc2b28e83def2
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 21456 bytes
SHA-256: 76bb04bf8bbf3a4acc10ec172e7a01b371cc7a55f71fcb6434878d9f5a2c8022
font_02_sfnt_off000135cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1