Malicious PDF — malware analysis report

Static analysis result for SHA-256 100082dc2274c600…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 10:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a22bf3d048880e34b73498aecfdbcb93 SHA-1: f1640cf65e04fb9c31805e8cd9c71aaae166aa72 SHA-256: 100082dc2274c60093b1e3200d31313a691b3be74ff6e62dcf145a5e6d27e051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, serving as a primary mechanism for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=advantages+of+using+technology+in+teaching+and+learning PDF link annotation
    • http://mannaz.pl/userfiles1/file/vodubanoro.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/simikudezolisitewun.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/badexolajetozu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d41ab0bad---86230141220.pdfIn PDF document text
    • http://gugugroup.com/userfiles/foleximojopokig.pdfIn PDF document text
    • http://ktcz.eu/files/files/gividakemodave.pdfIn PDF document text
    • https://bnovum.hu/downloads/lamaraku.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131596775d87---78782200575.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/26728054903.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/77455028092.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/fatituxupebatelukojefol.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4f55tljai74oc1cod1dn4hvsdq/bosiluzajodakupizepu.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/telulefupikaxasipagefo.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/34049781479.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109101026001982.pdfIn PDF document text
    • http://thevalleytrader.com/files/sowetanutemetowigisala.pdfIn PDF document text
    • http://vanhacollection.com/images/files/pabekaxajodabomesani.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/74073706345.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/molurusugiwutuf.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021921651360415.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/nixikotodupekobir.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/jigupelibiveloxuruzuler.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/2514632283.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.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_off0000c64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 15880 bytes
SHA-256: c1248f65933804c673ee90e47a2debd5203ab7330676281d332f4c0f0ff30ed3
font_01_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 11016 bytes
SHA-256: 09bbaf3e25243f2482a912cfbd3d1bcf141e197de521b060e8aa95440bd0e64d
font_02_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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