Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5caf6db7b7efd4f…

MALICIOUS

PDF

91.9 KB Created: 2021-07-06 15:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c10fbcf454cd62889bc501ebd7b05df SHA-1: 41924c9b87515d51ca26637e22c8c4d32aa3db98 SHA-256: f5caf6db7b7efd4fc01b0d6c2e7d961e5f300c4a2b2b14125cfb61c268476033
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm designed to attract traffic. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The document likely serves as a lure to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.x454.com/wp-content/plugins/super-forms/uploads/php/files/7vk9rlr510c8dspekp21o1rdu3/28565038017.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/722cd87a4a459062ab27a395679a39a1/15111483048.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d40a3ada155---fiworuzatetewof.pdf
    • http://pronobile.de/catalog/file/74594321584.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/20f08c267be2802db8522e536e079b08/28976436703.pdf
    • http://backupcenters.com/userfiles/file/85064803314.pdf
    • https://rocksoliddesigns.biz/userfiles/file/majuzileluxa.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/250aeab5bf5f5804c290975695d48d8e/woviwozamorabikipepa.pdf
    • https://finatwork.com/userfiles/file/tiluxovawunub.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461b2294e8---kenojoguwojujonefebad.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/12280603163.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a6c422a74b06dadf8097a6023881b008/56367261520.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/691b9aa0b0f227901572ffa1ad265999/27157067468.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609891bed6c82---90494757294.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/6851441666.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/34652425991.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083339dd38cf---benukamosetowafin.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f386e8ce---xagazusolome.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba5d15efe---77462870837.pdf
    • http://cnpair.com/userfiles/file/juwudetapefolen.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3d335fa90b8d65de56e83ee80d78706f/sunofifanizego.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/55609207666.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d47793466397f4e109669968f94b7538/92812658453.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+insert+check+symbol+in+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e798.bin
dbff02d90915d7538a65d1b005ce73a8299a2c89a526c33b13979879491d7798
pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 11144 bytes
font_01_sfnt_off00010138.bin
f4fc9234cd0decf3fbaa9173e8095d42b2e8fb19041ee08d138d498895fe4314
pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 17036 bytes
font_02_sfnt_off000119fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 16792 bytes
font_03_sfnt_off0001320f.bin
9c29870fc16aac6146f91ec27a596426bebf3238ad49cacac5d90f749eafa7b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 18552 bytes