Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f086bd41d2c579c…

MALICIOUS

PDF

103.4 KB Created: 2021-06-28 19:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 89a57834a592e80befa339c5e0e03cf6 SHA-1: 38f2e2c2288a36bd47bd381454a01d5d211e7d07 SHA-256: 3f086bd41d2c579cf76e3627a94db3682d1a8ea84fd0487fe9b87a952256f4ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites hosting other malicious PDFs. The primary purpose appears to be directing users to these compromised sites, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f279378a49959a349e4743c757404fd2/voxuzelegejimepekenadagud.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aad01771b---51386462523.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2c7bce5b3f0a7c1ad885e89584f47b35/pimivaro.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609432d5e866e---juzufutexalir.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/450cd6ca5e144f90333d4c8b6ff6b1e6/38585866329.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929b6be0d0---zolepopogoriwobiwamaw.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/makemiwimowofavatomikap.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/91692888713.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/mujomobato.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/53482579944.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5vkc2l6m486v3r37l9nuj9l6gl/58708361636.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bvob352vnsebqofr5s5aem1veb/kezepugovadivukug.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaf83edff---wagofesokepumezive.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3fe6b6c6b21e71940bfb2131ea9eb791/40441543063.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/sidepobalepoluniwit.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/429cd66866b350af6de168c40c468bd0/misedizabes.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/b7qcaneimgrgd7nb7g8eamijq7/tizemepuxokewedumasapofi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a08fbe32e247843831195219716e7ea9/22096033690.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47fd887e2---talolefawujotek.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bff8a5516b5---bejadiwizixefobizobi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c120411c682---zepefazidovetovafuxo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a4be9a37---ravinok.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ocmmme3d2671a00m3vj2g7ijh/wuwek.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/mewixazatubizodez.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sogifegatoma.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/egb65mho2pjmehgtq4k62fl11i/13290960883.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/laboxogakud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jesus+will+work+it+out+songPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 17404 bytes
SHA-256: f719ea7bec0221f6832b031b9ba4ffc8e020eac2889ab80633fd47c2b8230629
font_01_sfnt_off0001604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604F 10388 bytes
SHA-256: b862f836a2a6ed5711004831d038cb12ca8fcaf62c1e25e4b870db79e853477d
font_02_sfnt_off0001780a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1780A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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