Malicious PDF — malware analysis report

Static analysis result for SHA-256 be39ca59a8612e88…

MALICIOUS

PDF

98.9 KB Created: 2021-06-26 19:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c00aa41f8836b89c474fc811e01f27d8 SHA-1: 89d72a43b42a5f7f5c4e844a62a7d25138ec85b3 SHA-256: be39ca59a8612e887ff85a12ebc857a427e1787fad84d4b124ccaa5b4361170d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, hosting other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links on compromised CMS upload directories suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a223ad930c2b592446207e8bd97a4fa4/juzorenovatitogutomet.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd7096de9---45370723609.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ca1bb839---6121573510.pdf
    • http://botosani.ro/img/uploads/file/14373656390.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5483cb66---53392011068.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/g7enldl1468cpoq4pjrkbvk1ri/varixetusuwoja.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0998a3b2---82612223241.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/624dbb2906e29a5e3a4926d7a4a90977/1123623687.pdf
    • http://faradbox.pl/files/file/29737925737.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6043d8fe48c672398e52baf5b74d4d90/neraxefiluwekido.pdf
    • http://lungshingcentre.com/userfiles/98855971860.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b418698bc5---xopedewebuxejojugizubo.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0648c858---58209225545.pdf
    • http://dzbnf.com/upload/file///65992373574.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5aibe4ffnr9laporrqd0drrd0b/jedogabikexozumexa.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3efbcec377---kaxewolofekumo.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0d2b82d67944e701127e230e1a9fb444/nafukovovewuderadu.pdf
    • http://poorclarescork.ie/images/47872256313.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/egmorint52v4f7e05n3lj42ndp/26662305972.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a3404bb158121b43e0786b4b5028d6a0/12063577248.pdf
    • http://studiotecnicobonoli.com/userfiles/files/57661210784.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/644f026d67634423f64d04029b0648f8/80731883136.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a9343923---27266845852.pdf
    • https://sharadsangam.org/UserFilesTwo/file/bitixomituboduwovol.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f89a2f810---dunusiw.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b4eaec2c64c2c2bf9478eda7342c0bd0/68951284072.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=identity+for+addition+and+multiplication
    • 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_off0001002f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 16792 bytes
font_01_sfnt_off00011846.bin
f6d9d2c6e395a4de7f8b576ce51f101601b425215c32fdee71f8c45e00c1dc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 10780 bytes
font_02_sfnt_off0001310d.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 16244 bytes
font_03_sfnt_off000146f5.bin
175c1256fab22f1b6f2540db6e6bcdc31655e9af58d6651acb2f3fd793275843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 20360 bytes

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