Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d6db25b3e42654…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 13:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1090c3710879a914a49f3ca1fade65b0 SHA-1: c4feaa990bd85f1fb3b153d6fc9e3ef7cb0ab327 SHA-256: 82d6db25b3e4265466e4c441c5b70c2069380d5a55914c3cd8fde999231a5df5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links, some pointing to compromised CMS upload storage and others to disposable hosting, suggesting a link farm designed for SEO manipulation. One prominent URL explicitly mentions downloading an 'apk for android', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tbvshungviet.com/upload/files/50886731787.pdf In PDF document text
    • https://keongracun.org/contents/files/76466844657.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/16671261746.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/nasadidosenodub.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/rinoluxufulatosu.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/danizuwef.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/mamonixezokivepopep.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52af84c6a0fec68c1bcbead8215c62f8/xusobexuziwa.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/gusirawunameb.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/negovizufivosiw.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/25743348485.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/56044042772.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/mapigebenumijamowesolume.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/48240678697.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/bemeniveruwukukok.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/3682213008.pdfIn PDF document text
    • http://afro-safari.com/upload/files/woxanemodalutafimazujanim.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/rivelibis.pdfIn PDF document text
    • http://congtyvima.com/images/Download/tonuxodurebafelugobuki.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/8219396285.pdfIn PDF document text
    • http://canvangdientu.com/images/file/41217974358.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ctkmu67ma24jjlo3nf5nd2p5tn/31057934994.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/gekepogorejuruwikogiz.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4029edc0---38609497142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+%26+install+ghd+sports+apk+for+androidPDF 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_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 9732 bytes
SHA-256: 9461a25f93a644cea22ff0bb7a927d25fa200e0db3c12b0b6ca7a5c4a4717498
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 17416 bytes
SHA-256: e07982a7f1ad22cbd051417f21215ade61302f14a157a1cb7a1b58cc577370ac

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