Malicious PDF — malware analysis report

Static analysis result for SHA-256 1963c5a3933aff6f…

MALICIOUS

PDF

96.6 KB Created: 2021-07-26 02:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49ee0cf270abeb5a1ba160fa54e4afff SHA-1: 45b4187766a647dce632663db76482d9a1f7c8f0 SHA-256: 1963c5a3933aff6fe1bb2473c0191ceccd466ad40ccb33c2409636cffcc092d9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest it's designed to lure users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dvpk85ha91abtcn4lcmkv022e7/50502497580.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160909d6344174---56779725553.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3714126fb---ketajetekapimavinoluvetot.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb8fe1cdc---41117453510.pdf
    • https://inijariku.com/ckfinder/userfiles/files/zapimibu.pdf
    • http://crystaltrade.hu/data/file/semefekudunawebipubazef.pdf
    • http://perles-del-beya.com/userfiles/file/6868687210.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a73059777faff914ebdec9e07b2a5c12/94299846999.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdf
    • http://thekitchendesignstudio.org/uploads/files/zafuzuvuxe.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46dc43ee7d---18336734671.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0d090928cb18d0763c7078dcc0c0f412/kifevogi.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c90316d6---gekemaporigevurowetapu.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rafgqkp8fkjphs6rmi4r0s3ena/64529738955.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d93224be3f1---lakukafot.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qpju4gorsogh72f31of7skegq9/51908455121.pdf
    • http://perles-del-beya.com/userfiles/file/55950404249.pdf
    • http://armanetti.com/images/daliwelowofujatuzog.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e6966459---64647311398.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6324df2dd15ec21aa3df5824e529bbf8/sajarowelozizakujitak.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a16fbdb188db498852592ef35c0cfa38/16305869266.pdf
    • https://energooptima.hu/upload/File/82819983949.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf48adb4f00---95959165434.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1be2311a4---63085424636.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62438ba124---zodugal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+replace+drive+belt+on+troy+bilt+super+bronco+tiller
    • 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_off00011135.bin
f8ba5895e35b90d6433d02c4c3f404da7f6041a29d56d7cda7b4f99037fcc3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 17504 bytes
font_01_sfnt_off00013fa2.bin
3bd04e5611e798abd5c599bf4df825d686318d1fcbc2790550895c5fbffffe28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA2 11004 bytes
font_02_sfnt_off0001591c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1591C 16792 bytes

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