Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dbf37d5d7008d3…

MALICIOUS

PDF

84.2 KB Created: 2021-08-09 18:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4977fc890e89670e4c7139e9bd7d9299 SHA-1: 05452f639d31c62b628820716e75432b5c18ffed SHA-256: e9dbf37d5d7008d339f8ff5758e4a092d4837e7a8beb753b91fbb0a16b6ebd19
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 ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites that host other PDF files. These linked PDFs are likely part of a phishing campaign or a malware distribution chain, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a001c7ae4e5---palebelamujikef.pdf In PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f02c9de174b924fe7b558d77392faf40/31069434076.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c712dbe4e---41246193152.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/72191478992.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61459783865.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7d8c68d8d83050d8632d88643d24ffce/gezebopagotitibugu.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/62926816818.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jetebozetezo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/57591459242.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3f968ae---74999549909.pdfIn PDF document text
    • https://mavibusiness.it/file/werunezulizifi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l3tnu7ckg8ffvt5mrb0iigs5h9/nameturovigapubupigoxipu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ae0e6843f488b5683d5a3ed4bc9ebd74/puxoxifegi.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/tuwabifam.pdfIn PDF document text
    • http://posuni.com/userfiles/file/38809517176.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/nizejigopejebesutudi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/1530417be00d1352ae2f574950500beb/65798753174.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/gasimezidexorotemolu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f969579fb73---zewomi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/pru34njdeceqhe355qeph07jt1/dowowurimo.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/31998220951.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f72229538---92449044270.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9663d8f6c---19075653278.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fonufofepofinoduwadomo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/valavazenetuw.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/wivomujemomuzominediwipu.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ad5d98edb4988f018454c5e3ba64edde/mafigeripafofuzuligejaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+lspdfr+on+ps4PDF 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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 10576 bytes
SHA-256: 352f2329c2fed5a3e432cf194cd662d4179f9645968a6a28a6d93f89d27b1e97
font_02_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 17316 bytes
SHA-256: 1b5897e839a20f87ea7f2e32187fa80ade450d9e599c3dc200761e655dff894a

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