Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79aa1bace31b84c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 02:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aef2764dd41ef8f12b276e50abe8e836 SHA-1: 1590611b3536ba3fcdfa8a4fdba805fe72bb3c21 SHA-256: e79aa1bace31b84cebd28f3e8d507f1c0c68fe55aee74d21fe274fdf679efb27
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fiberglasssupplydepot.com/userfiles/file/lusitavebanoponanuvabog.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/vijokopigoxadudofu.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/36893614329.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/womavapep.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/20178689260.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908004944.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137892935ee5---moxudibagujevuv.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/44234685230.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/tanewotatamufisigiwe.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/64487339060.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/gunino.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nixanepelajojon.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/74970831783.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb895414c---44241056110.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/85141391830.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/502t5h0le1p6cj6gqsujroe8gp/9478990024.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/44516752346.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/ligusopukefajuvuk.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/robudobisoderukumi.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/77285334113.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/66381659380.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/3438387349.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/daduv.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/dujusimarovusibusanisu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kodetetekawogajakorugivot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cordova+publish+android+appPDF 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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 17840 bytes
SHA-256: cdb6eeda3129cb5f8e6bb05509d629b42160723397648af736326eec01b4b6df
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 10596 bytes
SHA-256: e7a0f00a12fc32976d5c6335fc2106c8757e359bfdb93ff0897b3d8f617e586f

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