Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a44f9602920174…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 14:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 177c424830a0f2ae3e4d1ad96b8e6801 SHA-1: 367557407c989426b68ad68c10757843eb0c5638 SHA-256: 36a44f96029201747fc76296c86459708dcbc20caa2610ad9ddacd2ed6691f1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=weekly+grammar+worksheet+conjunctions+answers PDF link annotation
    • http://geometrarontani.it/userfiles/files/34425495187.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160755d9241f6f---49408750260.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/71091959055.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/98029077523.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/2f14c4e80d7a62f1d04991a025c3fa08/xojoxujagezesanazetizuxe.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/givow.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/42343629422.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9bea44441d198f77534d18ad181cbbc4/mutexudo.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/55219919515.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/kanal.pdfIn PDF document text
    • http://df-2.de/images/daten/file/16577210528.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/33106354546.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b580a1906086798ae1e7ac96c7e3a1b1/lepuripaboxe.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/89767732721.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fubazukudigawumurogajan.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/9463577525.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf21beaf2f---26106809357.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210906134759.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/468d110e96a557410cc229f9c24fb5fe/sofazujoretilo.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/tavusetudurisevefalalutim.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161248abfe7022---juxoxebezukazoruxifilo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///wevagubivonuvi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fad02dc6---33063288283.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/84617869712.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/vifozelazorasuxizaf.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 11192 bytes
SHA-256: b7c4861960cf17233c7d2110b1dd7cb844d881e5769d9906fc72a28987d04e3c
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 17352 bytes
SHA-256: 277d7fab5ef6d1ded8e149fc3d62e15e0fc95b5facfdbc7637d593d5a83b6e8b

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