Malicious PDF — malware analysis report

Static analysis result for SHA-256 73750ce3f806c6a0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 11:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1ca9da1cab99c106242aacfc85ceafb5 SHA-1: c29be89bd681481446c0e285d3c4fed55d45871e SHA-256: 73750ce3f806c6a0c3e14c25f471ea4924c97b25b1cd2b998a0bb82932280046
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://oniceh.ru/uplcv?utm_term=download+boruto+manga+pdf PDF link annotation
    • http://snailgame.ru/upload/files/20210914101521.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161312dda2477d---32107587555.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/12779218572.pdfIn PDF document text
    • http://jainfarms.com/uploads/devurojijo.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/629825991.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wagogivivolerinugatitoxo.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/gevosubumaradat.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a18dad2c---gupub.pdfIn PDF document text
    • https://eventaipei.com/upload/files/jidifitete.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mafopuwofefamujosijep.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/sofokamenoxulegaxefunub.pdfIn PDF document text
    • https://unosms.us/userfiles/file/dizemusozugoz.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/12162150275.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/pemejalitozemuvitudilusu.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/29227160995.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/67839470018.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131184b87a75---jamabuzarewizebufogivevi.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/konak.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/5242080605.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vulefekib.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/49112597244.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/77994531036.pdfIn PDF document text
    • https://korankertas.com/contents/files/jikinodomigokagi.pdfIn PDF document text
    • http://esistore.be/userfiles/file/47317400193.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/bonek.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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 20164 bytes
SHA-256: a6c9d4c364af475fc316318b2a02d112243b16a3df1ac0888765fa10a53f3cdf
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10776 bytes
SHA-256: 84b6d582a9b910e8bacf26f4e81fa972a5051487ad822b352a0344ae27c9bd0b
font_02_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1