Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa03c1e8a2694e21…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 20:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 218848fd04ae51f46973623055a8f949 SHA-1: bda52c115d0270bdd75eba7b29407fcb3114bbd4 SHA-256: aa03c1e8a2694e21c1a32da4207f3cc8e64ea6352bdd2180ca4e62f300a37e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised WordPress uploads to various PDF files hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attack, likely intended to deliver a secondary payload or lead users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f508a00850---fineduraw.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/2659501257.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/59812326426.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/54435750367.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/bobamidemebox.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/16949365842.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/rosadusiresagodabojukuke.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7284ef024092c046ac5eef113fa2c9a2/bibazigagozer.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/fimejobij.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380abe4eef8---manovonexowozedorez.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/55087614696.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eu1a5nobrqv63oe4iqt8vndjp/4242919640.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gewix.pdfIn PDF document text
    • http://edituj.cz/res/file/71599149422.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba0f2565---59370692038.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/22512533002.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/10613319432.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/64716458790.pdfIn PDF document text
    • http://knipia.com/userfiles/file/bojilajatotufo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492600a2dda---jijifabal.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/71158748089.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/fulafo.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916152486962.pdfIn PDF document text
    • https://teamcode.net/upload/files/zoxidudowawovo.pdfIn PDF document text
    • https://kaparatt.com/images/File/tedijati.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/sazadulemutufosuno.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/40676892301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tu+hi+mera+sundayPDF 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_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 10428 bytes
SHA-256: 55336b7bf8a0a10ff299908258d119334122091335492238c42583a6b0596866
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 17884 bytes
SHA-256: 019d48351db07ed5de9bf8b15fc89ed956705e1560d43cca9d401ed94e493223
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.