Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a74f650696b7f58…

MALICIOUS

PDF

182.9 KB Created: 2021-07-16 11:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b9efb95063de0ecbb59e9f3d46717f65 SHA-1: 7f99c2f9d99e93c17a5d4e2ef5fdb8fb3a380b92 SHA-256: 3a74f650696b7f5839fa15ee7f9975cb117aee1977c656671d4ec09d5b665038
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://chcial.ru/uplcv?utm_term=fiscal+policy+formula PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c299a2b790f---29003147967.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502065933882775.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/jowumub.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/59e8005e8396b5fc30b72beb4983ebc4/48904245445.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/dkl2ql8kghik1b5jm9qan3v252/53699136641.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rivorusidolexigofetopow.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfde86816---sobemikurufuwom.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/26731037839.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/79282255746.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/jekavixoxanaxeku.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/5956c0962d06ae2571dfc6352e429397/5325035965.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/21fd59b0772c37b3a85d05c00f06e5d7/pegoleminenatawerilusiji.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/686db30588ba97e15133338469bd93fb/66313734327.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc48571fa---48322948385.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/38146035808.pdfIn PDF document text
    • http://3sdent.com/upload/files/leromen.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/80545334436.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/32195226715.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98032902a---vofawabelotis.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e3b9140b0f6f501829c6baa56ba8e6b8/taxeviselagolemafeleti.pdfIn PDF document text
    • https://chpcentre.com/files/file/69783164749.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/35dcc0b9a45f279813112640c4362604/gesugekotigekusenez.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qkjbab0hvv67m2deh63af0t2kq/21349919786.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1d164e0f---88880715935.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_off00026c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C4E 18852 bytes
SHA-256: 5f10b72904f7da95a6b72cbc0ea8c89ca6738514aad240a1bf8f960af8c39aa4
font_01_sfnt_off00029e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002b61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B61D 10496 bytes
SHA-256: 9cdcf93676506ff1755e3faa0a0717efc320c5551161fcf1faac4a981fa553dc

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