Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c82e3885d9260…

MALICIOUS

PDF

88.3 KB Created: 2021-07-14 04:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3549c80e3430704a78f79d30ba12f30e SHA-1: 0a835e1ab1ec0699fe6caa71b209bf613d33aadd SHA-256: a76c82e3885d926030cd0ad1f433fd59ec66b4352d9899f6ac81931c60eaf729
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination or leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=gastric+bypass+and+alcohol+blackouts PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19abcb6ddc---50632799303.pdfIn PDF document text
    • https://cargobull.cz/res/file/lufisapefemexelupizaz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f633704a3---53163524165.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6905b388de37bc1eeccf7f38f889f07c/modexuzovejamumatoki.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorititag.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/8490545376.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf7df3fc34b69f9acb3b316e959ae4cf/fumojonerixonogasegota.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/beut4d1k9175iu8lkio39rt5nq/42127515082.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3a8dd0de---31453761602.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f5e96f4163d760566d59db7e98960ea0/49176445294.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/gamafalasuzava.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/42799500634.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9015cc509f60c1e97e2bc38cecf5b7f6/fajudekifopoja.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kc8lh8pv6am58s6sdspb2uvvf6/7121084380.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gllbbqspis29an95c3j58a0554/girenasurisebalozamoduvub.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rexopogogevavave.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2953f0487049902e72ca0d77c22f2e10/bosazivepojirikir.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/samumunina.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/16281479352.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6240d5a5---zavapukeluzediwofegurodex.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jewuzifaneraxinorowijor.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/87764883248.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f97c6b8a4fe7643e271a7861896e88d/nomumilolepig.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/wafegivifugorop.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/bomoreruduzovegave.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94a64853ef25101e30093ad5285bb907/24224266601.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/fugewugimabuwev.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cf624d942a11a0ec28b5d2e3ed7ad10d/nowikewewukolivanoziju.pdfIn PDF document text
    • 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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 16652 bytes
SHA-256: e45d3f7119159b7d56cfe1fa783e6a577a8b6507e44f2f148f68327fc94c2ead
font_01_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 10964 bytes
SHA-256: 23e5f02d50fe47d4a05f1cae7bff8b7bd89c21f43219ec9e5e6c5fd51a4067a3
font_02_sfnt_off000139de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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