Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ad9e992536eb53…

MALICIOUS

PDF

105.5 KB Created: 2021-07-15 10:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cef9cb9b4dacd22d8eee41765b427767 SHA-1: 6918696604494c6bf1086ae0874601b5e276b340 SHA-256: 53ad9e992536eb539ef76a1ecd0a871368ceaca6aacbb28b41788698bedfb602
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of compromised hosting and a high ML score points to a deliberate malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6123ea3a2---9337177355.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/620d009cd5ea11263054c839c95270e6/43946980032.pdf
    • http://ithaca1961.com/clients/875375/File/kajoforokov.pdf
    • https://sieuviet.net/webroot/img/files/70184106679.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/758354df6c60d0b63f2b3fbeac81aa50/donazibenoratemovu.pdf
    • http://www.urbanwaterways.info/files/nazetexuxezetarapipi.pdf
    • https://luyenthitoeic.info/userfiles/file/58957802405.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6d3310f9e15f283598bfa3c91a4af2ba/bopiwora.pdf
    • http://breakevenpoint.pl/uploads/editor/file/sojonirogarojamibojunotep.pdf
    • http://sharidyer.com/clients/863431/File/giromofam.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nja3k036a2tpok5n9qj6dttl76/lulabumufelutajo.pdf
    • http://robalton.es/Albums/images/file///67169582842.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608567e01338c---tefepereboxogiledu.pdf
    • https://pet-fashion.ro/mm/file/kifedixagolo.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5798b4c7---66416291468.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j1ki13u8c76cargqabsiop3o00/lutomufukapefexejudi.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2332b711---38782170844.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/pisupedupefazejemepimo.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/bodigu.pdf
    • https://angkoronetour.com/userfiles/file/14748152979.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/niweputigefelifidizud.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e74f6320894---duloxixawogapuvewu.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/titajademexenozokifib.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aecb11f0b8---579558525.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22197f7d1---fatidovavefip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+golden+tower
    • 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_off00013d52.bin
9deeb575d0451d8a3ee76a0da25c48bf8b395203dddf993d5bb3e8fdf9e7d669
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D52 10152 bytes
font_01_sfnt_off000153cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153CD 16792 bytes
font_02_sfnt_off00016bdf.bin
f4af3ec28bde71afad45e5f1c3cfe7d64af3ab74517d4101be425d8d3dca7b41
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDF 17348 bytes