Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba7858e9120e1d1…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 20:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 077add57bb97eab126d95b2c7b929e80 SHA-1: 7709ddf974b316282d50f3c7b1f4e0d4cecf76da SHA-256: 7ba7858e9120e1d1e62a29ab94df0472421c2640abd0df553072759db63e0edf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://scheidenschiedam.nl/uploads//file/wopizeninolu.pdf In PDF document text
    • http://superplasticizer.cn/d/files/89538905824.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/22617411534.pdfIn PDF document text
    • https://latework.cz/soubory/xorubedorogagakomim.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4596153a67d516df4637ef542fa8ed60/45501235922.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/66693572181.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d88c68fcd---gujopixemupadomi.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16214578287854.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/37534916743.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b0736a38cfdac0b30d21db094461428b/sisunobowadejusaxavejig.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b381fd52b9---92466010920.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210626090616482782.pdfIn PDF document text
    • http://ridendo.cz/files/file/19748191641.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b6afa3ef6f15ebeb0d60af91eced5afc/zisabegunozor.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088279b5d4ef---segunesiduzegegupulim.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/86060188906.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zosakedudepumidufufe.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0809832675.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c57ae0e9---fetoxegalurakora.pdfIn PDF document text
    • https://energooptima.hu/upload/File/fiketale.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/11692023068.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vurunaso.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e4fb355f9---mofanemodoj.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/pudelizewekokoso.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tkgrjk5d4bfodbfnsg3ldrd832/gafutejuvavulisozus.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/jawuwifomedupuluvusoti.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007ed173e81---xuxuvad.pdfIn PDF document text
    • http://turnyras.lt/Files/file/12939813721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=irregular+plural+nouns+worksheet+grade+6PDF 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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 17116 bytes
SHA-256: d796168fa1c2ae0d08533697397b2170e021ccd7d6d2a89c8293e54f0ba3500a
font_01_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 10976 bytes
SHA-256: da4d74a5511e3a23810d39be3833fa93cce0dd1381e3435caa23eda3a4408552
font_02_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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