Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa3bdc97573dd8e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 10:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae9d4b57aaf6bb773535d865661c04eb SHA-1: 70b3f17f2c0bb436d1269c983c8760489ecba70d SHA-256: 1aa3bdc97573dd8efdf4a464f6b466122c31082eb23ca29c9b527c3885bf7801
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sukusipufowajerilebumi.pdf In PDF document text
    • http://exoticland.bg/upload/files/files/84398606361.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2591c40a---bipetivajiwemusulu.pdfIn PDF document text
    • http://billsky.ee/files/file/fazivozexijobog.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/526ca03810333e30769b9d51620236fe/wigikexidenawupitoliwik.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dd57547a0---37314207140.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fg2m6qvli6temmr1pkt10c1o67/komimof.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8f1345ef4831bf0c776863d47aedc934/17813433021.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/37822613869.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/xinuvujiwusulitut.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-25/20210525023335675653.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/81351268114.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cd6ebd44---puxadagamuboda.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a6d37b84d3c1fb85ade879ae4a58c348/mulakizixegiwatujo.pdfIn PDF document text
    • http://polipack.ru/content/file/sajejadaje.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/78391042337.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b72b87afa41b32caf3790310c4b75b79/sifirin.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/37030156089.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vagazugajotupebuvamori.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/652947372.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/rukulemak.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/bixogewomiwitosetepadomi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/bizodupikimikigiri.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/3295769231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tn+forestry+syllabus+2018+pdfPDF 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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 18264 bytes
SHA-256: d622471d74f26c80f1507a41b0cb756a46337a1db9aac9d2f5805171cca25205
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 11216 bytes
SHA-256: e05767a964f16624f5414f09fcef8b53f6e3e86bc0db0428b35a91ffd8e8a443

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