Malicious PDF — malware analysis report

Static analysis result for SHA-256 2547984a3adb82fb…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 14:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d36b064851325f8fd42c49fdd79a9a9 SHA-1: d14b8bdef96d76e1fc4be94279d4ee571ce88490 SHA-256: 2547984a3adb82fbf8d331ee0e02199503d4a9272351c574388560338038dedb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a966b22c77---kofokaruniporurum.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/rogixexexa.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/51103338769.pdf
    • http://joy05.com/_UploadFile/Images/file/58391704654.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/gemozalufiginafovokujun.pdf
    • http://vitanova-cattery.com/upload/file/32654260062.pdf
    • https://advantagelic.com/singhania/downloads/file/1867459379.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9d95e40dbc7bf8d4bd45f23adadcad07/93240031329.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee55023b83---dulupiwigufevoxumaxi.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/70689024617.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93759714a4f310172bdc60372bd69bd6/zagozebosuvowomefa.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5f7e2c8fa525f87eef4607ffe8344a3e/vedejap.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2r3l2a8klpbgf0dj1q3ttjlgq2/lobakuzadezevarapes.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/c097ae36a607c54ed7f1dcefb6e96703/19931445565.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc4dc0b3f---51102187571.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/72be31a587e6f9012b2b098e22090ad0/segizola.pdf
    • http://nfc.soo.jp/file/divipirobupusurugegevi.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/febab7b1c2d784fd36b0e640e9eb8d9e/97616136566.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c4c4fc0d86a030f5d11b87af528aef44/7536965163.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf663e2977---vogizesefaf.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/288r6rbkhi5kkhov6sfnqsn146/16657831064.pdf
    • http://sunjewelsonline.com/userfiles/file/novujapujariromimemaguj.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074aee94fb5b---73457701352.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/74d078d3d1ef9c948392478b754d28e9/gobafexoxaz.pdf
    • http://inlygiaylynhua.com/upload/files/vedipugakimiv.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a8568a2d---jasapoxudu.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ks339p5m8kjnj6ejs9rkonbflo/soxegujiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+smallest+bone+in+our+body+is
    • 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_off0000f5c1.bin
e3dde1309a7cda569c4cc783daede9245a9e25011913b358b60d24cd283523eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 17392 bytes
font_01_sfnt_off00012324.bin
99b98880f0041fcea6849df5570ac6b7d2efadab5d91825ea97385ac68dfd83a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 10832 bytes
font_02_sfnt_off00013bef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 16792 bytes