Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea882742daac4267…

MALICIOUS

PDF

88.3 KB Created: 2021-07-22 10:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f548bb3020e60c960204642cfbfbef71 SHA-1: db80aa346662094c27dd1d4c77d1158358264a9e SHA-256: ea882742daac42675a0d309b3a85dd8beae5d19cd9af6b7167e3a23357526885
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further payloads or conduct phishing. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5670388dc6---xazijewukamipepifelo.pdf In PDF document text
    • https://hosvagyok.hu/userfiles/file/wexabumoki.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3cd1847f---90934497059.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64f68a086---13093380259.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/lamoxezobevob.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/linogidilumujow.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/87899854902.pdfIn PDF document text
    • http://twilaw.com/files/files/28904956935.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/cedcaf1be43ff43c21b0753980b8ff23/pavater.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea2d50b4d---72751991548.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/43960df86f645850fe53d266092a33d2/zidasilutuxifuka.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0087e3f5b---nafamarijelowovipi.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/36883535822.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/79524054047.pdfIn PDF document text
    • http://roocenter.ru/upload/file/lapawojewozotuwunez.pdfIn PDF document text
    • http://goref.ru/files/file/95984590274.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kexoborut.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/56844907093.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d09a055c0bc514e9f588e9b44fbec68f/38269236752.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/99577288384.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4c649207e---labipujinan.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/61096744251.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/83edc350a923b1d587dc900789ef8ecd/54212597655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+distance+around+a+polygon+is+calledPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8e64de9fce2cb8eeb4ba2067d125e8ec/xunojerisufazadugiwiv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 17712 bytes
SHA-256: c135d54bf02ded09494e02cc4988da8e4982f26b7d88e8f05956168f301d20f5
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00013a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A31 10968 bytes
SHA-256: 4287e06c1a87faad89e2dc7cdba54632a41d320f0d9f0b6ee27c085e226f74f2

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