Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3ce013a62f59e3…

MALICIOUS

PDF

104.1 KB Created: 2021-07-22 19:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03083e0747f3251c6ad5497a53bd001b SHA-1: 08a44148439fc21e6c55b5587f7322ddb386e1fe SHA-256: ae3ce013a62f59e3028978d6e7f636b4e68a6e22090e3dabf0cac21cedeb8e47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bad385a0468---jizamurufo.pdf
    • http://veterinariomauracotti.it/userfiles/files/18684300473.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5b30c3e9f---dokegig.pdf
    • http://grafiport.com/userfiles/file/38252976212.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/e4213ag9eajd9b9o1sjfl4ce60/wisixose.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/429dcd56b6e958b4916286ea540eef62/10886458773.pdf
    • http://doo-san.com/userfiles/file/20210509140911.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/17505326310.pdf
    • http://haohanlegend.com/Uploadfiles/files/69202014199.pdf
    • https://maisonforville.be/documents/file/29255494226.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075da5b91424---kozamorikojapupaz.pdf
    • https://oklasik.com/ckfinder/userfiles/files/84613742828.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vh4r4m1pa21djukd13koauhev1/72310350594.pdf
    • http://allycatering.com/userfiles/13048571870.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/baa144a94fb2dd8065f7187dcb248b3e/gamarodojoliv.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b780ccde179---ganasididulubuvixitan.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/45766043554.pdf
    • http://zwickerfoto.hu/_user/file/5480452067.pdf
    • https://ckmandarin.com/uploads/21508759544.pdf
    • https://securityguardsupply.org/php/uploads/file/90263490636.pdf
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=contracts+constituted+by+law+contract
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b9.bin
b6865f1249cb085cc39fd026cf812f34c2a55d77bf97f686260d98d53807c2dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 17272 bytes
font_01_sfnt_off0001603e.bin
83ac51859f7bde7c00765e0b59db38b34771c5d74f143668dfdf0d3bc2721450
pdf-font-stream PDF embedded font (sfnt) at offset 0x1603E 10836 bytes
font_02_sfnt_off0001797e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1797E 16792 bytes